External Otitis: Causes, Symptoms, Treatment, and Prevention | Clinique Omicron<\/title>\n<meta name=\"description\" content=\"Otitis externa is an infection of the external ear canal causing pain with pressure on the tragus. Treatment with antibiotic ear drops, malignant otitis in diabetics, and prevention in Quebec.\">\n<meta name=\"keywords\" content=\"otite externe, otite externe traitement, otite externe sympt\u00f4mes, otite du baigneur, otite externe gouttes, otite externe diab\u00e8te, otite maligne externe, otite externe Pseudomonas, otite externe pr\u00e9vention, otite externe Qu\u00e9bec\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Cinzel:wght@600&family=Poppins:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Cinzel:wght@600&family=Poppins:wght@400;500;600;700&display=swap');\n\n.co-wrap * {\n font-family: 'Poppins', sans-serif;\n box-sizing: border-box;\n}\n.co-wrap {\n max-width: 1100px;\n margin: 0 auto;\n padding: 30px 0 60px;\n margin-top: 10px;\n}\n.co-label {\n font-family: 'Cinzel', serif;\n font-size: 14px;\n font-weight: bold;\n 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solid rgba(50,60,82,.15);border-left:4px solid #FF611C;border-radius:12px;background:#F4F6F8;font-family:Poppins,sans-serif}.oc-fiche-cta-t{font-size:18px;font-weight:600;color:#323C52;margin:0 0 4px;line-height:1.35}.oc-fiche-cta-x{font-size:15px;color:#4D6577;margin:0 0 14px;line-height:1.55}.oc-fiche-cta-b{display:flex;flex-wrap:wrap;gap:10px}.oc-fiche-cta-b a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;box-sizing:border-box}.oc-fiche-cta-b .oc-p{background:#FF611C;color:#fff}.oc-fiche-cta-b .oc-p:hover{background:#E04E0C}.oc-fiche-cta-b .oc-s{background:#fff;color:#323C52;border:1.5px solid rgba(50,60,82,.25)}@media (max-width:600px){.co-wrap h1{font-size:24px;line-height:1.25;text-transform:none}.oc-fiche-cta{padding:18px 16px}.oc-fiche-cta-b a{flex:1 1 100%}body .co-wrap > .co-table,body .co-wrap > .co-table tbody,body .co-wrap > .co-table tr,body .co-wrap > .co-table td{display:block;width:100%;box-sizing:border-box}body .co-wrap > .co-table{min-width:0;table-layout:auto}body .co-wrap > .co-table thead{display:none}body .co-wrap > .co-table tr{margin:0 0 10px;border:1px solid rgba(77,101,119,.18);border-radius:8px;overflow:hidden}body .co-wrap > .co-table td{padding:9px 12px;border:0}body .co-wrap > .co-table td:first-child{font-weight:600;color:#323C52;background:rgba(77,101,119,.07)}#ocw{transform:scale(.8);transform-origin:bottom right}}<\/style><div class=\"oc-fiche-cta\" data-oc-cta=\"fiche-haut-consult\"><p class=\"oc-fiche-cta-t\">Obtenir un avis adapt\u00e9 \u00e0 votre situation<\/p><p class=\"oc-fiche-cta-x\">Consultation en clinique ou en t\u00e9l\u00e9consultation, partout au Qu\u00e9bec.<\/p><div class=\"oc-fiche-cta-b\"><a class=\"oc-p\" href=\"https:\/\/cliniqueomicron.ca\/rendez-vous\/\">Make an appointment<\/a><a class=\"oc-s\" href=\"https:\/\/cliniqueomicron.ca\/consultation-en-ligne\/\">Consult online<\/a><a class=\"oc-s\" href=\"tel:+15146063350\">514 606-3350<\/a><\/div><\/div>\n\n\n <div class=\"co-intro\">\n Otitis externa is an inflammation - most often of infectious bacterial origin - of the external auditory canal (EAC), i.e. the cartilaginous and bony canal connecting the pinna to the eardrum. It is one of the most common ENT conditions in general practice, accounting for over 10 million consultations a year in North America, with a peak incidence in summer - hence its popular nickname of 'swimmer's ear\u00ab - due to exposure to water, which macerates the skin of the canal, altering the protective lipid film and raising the local pH, creating ideal conditions for bacterial proliferation. Its clinical presentation is characteristic: sharp, often intense ear pain, strikingly aggravated by pressure on the tragus (the small cartilaginous protrusion that protects the entrance to the ear canal) or by traction on the pinna - this sign of tragus pressure being pathognomonic of otitis externa, distinguishing it from acute otitis media (pain not aggravated by tragus pressure). <em>Pseudomonas aeruginosa<\/em> and <em>Staphylococcus aureus<\/em> are the most frequent bacterial pathogens, responsible for 90 % of infectious external otitis. Treatment essentially relies on antibiotic ear drops with or without corticosteroids (ciprofloxacin + hydrocortisone or neomycin + polymyxin B + hydrocortisone), whose superiority over systemic antibiotics for uncomplicated forms is well established, with cure rates of 85 to 95 % in 7 to 10 days. The most serious complication is malignant external otitis \u2014 also called necrotizing external otitis \u2014 which occurs almost exclusively in diabetics and immunocompromised individuals and in which the infection by <em>P. aeruginosa<\/em> extends beyond the external auditory canal to invade the temporal bone (skull base osteomyelitis), requiring prolonged systemic antibiotic therapy and urgent hospital management.\n <\/div>\n\n <h2>Pathophysiology and risk factors<\/h2>\n <ul class=\"co-list\">\n <li><strong>Natural defense mechanisms of the external ear canal:<\/strong> cerumen (wax) \u2192 acid-lipid film (pH 4-5) + antibacterial and antifungal properties (lysozyme + immunoglobulins + saturated fatty acids) + mechanical barrier against water and microorganism penetration + natural migration of the eardrum canal epithelium towards the acoustic meatus \u2192 natural self-cleaning + intact protective film \u2192 resistance to bacterial colonization<\/li>\n <li><strong>Factors that break down natural defenses:<\/strong> Water maceration (bathing + swimming + frequent showers) \u2192 cerumen denaturation + pH elevation + epithelial edema + microtrauma of the skin lining \u2192 entry point for bacteria + scratching and excessive cleaning with cotton swabs (detergent of protective cerumen + epidermal micro-lacerations + very frequent) + foreign bodies + hearing aids + headphones (obstruction + heat + local humidity) + atopic dermatitis + eczema (disruption of the skin barrier) + psoriasis<\/li>\n <li><strong>Pathogen agents<\/strong> <em>Pseudomonas aeruginosa<\/em> (38\u201365 % of cases) \u2192 Gram-negative aerobic bacterium ubiquitous in aquatic environments + thermotolerant + natural resistance to usual antibiotics + <em>Staphylococcus aureus<\/em> (15\u201325 %) + polymicrobial in 15\u201320 %of cases + fungi<em>Aspergillus niger<\/em> + <em>Candida albicans<\/em>) in 10\u201315 % of cases \u2192 otomycosis (common in the tropics + in recurrent external otitis + after prolonged topical antibiotic therapy)<\/li>\n <\/ul>\n\n <h2>Clinical presentation<\/h2>\n\n <table class=\"co-table\">\n <thead>\n <tr>\n <th>Clinical sign<\/th>\n <th>Description and characteristics<\/th>\n <th>Diagnostic value<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Ear pain (otalgia)<\/td>\n <td>Sharp pain, often intense, with a gradual onset over 1-2 days, localized to the ear canal. May radiate to the jaw, temple, or neck. Worsened by chewing, speaking, or the ear touching a pillow. Intensity varies from mild to severe, sometimes very debilitating.<\/td>\n <td>Cardinal sign of otitis externa + present in 100 % of cases<\/td>\n <\/tr>\n <tr>\n <td>Tragus sign (pathognomonic)<\/td>\n <td>Marked aggravation of pain on direct pressure on the tragus + or with gentle traction of the auricle upward and backward (stretching the cartilaginous canal) + no change with acute otitis media (AOM) \u2192 fundamental differential sign<\/td>\n <td>Positive tragus pressure sign = otitis externa until proven otherwise + sensitivity 80\u201395 % + specificity 90\u201395 % + the most informative sign in first-line otologic physical examination<\/td>\n <\/tr>\n <tr>\n <td>Otoscopy<\/td>\n <td>The external auditory canal is edematous and erythematous, often narrowed or partially obstructed, with skin debris and seropurulent or purulent secretions. The eardrum appears normal if visible (unlike AOM). There is sharp pain upon introduction of the speculum into the canal. Edema can make visualization of the eardrum impossible in severe cases.<\/td>\n <td>Allows confirmation of external otitis + visualization of the eardrum's condition (pre-existing perforation - contraindication for ototoxic drops) + pus sample if recurrent or resistant form for culture<\/td>\n <\/tr>\n <tr>\n <td>Ear itching<\/td>\n <td>Itching of the ear canal + often precedes pain in early forms + predominant in otomycosis and dermatological forms (eczema + psoriasis of the ear canal)<\/td>\n <td>Itching predominant over pain \u2192 consider otomycosis or ear canal dermatosis + itching alone without pain \u2192 may be contact dermatitis (ear drops + hearing aid)<\/td>\n <\/tr>\n <tr>\n <td>Hearing loss and blocked ear sensation<\/td>\n <td>Mild to moderate conductive hearing loss due to canal obstruction by edema and secretions + ear fullness sensation + possible tinnitus + resolves with healing<\/td>\n <td>Conductive hearing loss in otitis externa \u2192 blocked ear canal \u2192 tuning fork test: ipsilateral negative Rinne<\/td>\n <\/tr>\n <tr>\n <td>Peri-auricular lymphadenopathy<\/td>\n <td>Pretracheal, retroauricular, and high cervical adenopathy, mobile and painful to palpation, indicative of a significant local inflammatory reaction.<\/td>\n <td>Present in 25\u201340 % of moderate to severe forms + their presence indicates infection extending beyond the tract \u2192 consider systemic antibiotic therapy<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n\n <div class=\"co-infobox\">\n <span class=\"ico\">\u2139\ufe0f<\/span>\n <span>The essential clinical rule for distinguishing otitis externa from acute otitis media in the office: gently press on the tragus with a finger. If this significantly worsens the pain \u2192 otitis externa. If the pain is unchanged \u2192 acute otitis media (where the pain originates in the middle ear, not the canal). This simple maneuver takes 5 seconds and correctly guides treatment in 90 % of cases without requiring an otoscope.<\/span>\n <\/div>\n\n <h2>Treatment of uncomplicated forms<\/h2>\n <ul class=\"co-list\">\n <li><strong>Ear canal cleaning (essential preliminary step):<\/strong> removal of debris + secretions by gentle syringe or bulb suction + or gentle irrigation with warm saline if the eardrum is intact + or careful wiping with a gauze wick soaked in antiseptic solution (boric acid + alcohol + or Burow's solution) + a clean canal significantly increases the effectiveness of ear drops + do not instill drops into a canal blocked by debris<\/li>\n <li><strong>Antibiotic ear drops with corticosteroid - standard treatment:<\/strong> ciprofloxacin + hydrocortisone (Cipro HC\u00ae \u2014 Cilodex\u00ae) 4 drops \u00d7 2\/day \u00d7 7 days OR neomycin + polymyxin B + hydrocortisone (Cortisporin\u00ae otic) 3\u20134 drops \u00d7 3\u20134\/day \u00d7 7\u201310 days + the presence of a corticosteroid reduces inflammation + edema + pain + accelerates healing + ciprofloxacin is the only topical antibiotic active against <em>Pseudomonas<\/em> available as ear drops + drops can be gently warmed before instillation (reduce dizziness) + lie on your side with the treated ear facing up for 2-3 minutes after instillation + pull the earlobe up and back to straighten the canal (adult)<\/li>\n <li><strong>Ear wick if ear canal is narrow<\/strong> If the swelling obstructs the canal and prevents the drops from reaching the depth \u2192 insertion of a cotton or gauze wick soaked in antibiotic drops + allows drainage + promotes drug penetration into the stenosed canal + to be removed after 24-48 hours<\/li>\n <li><strong>Systemic analgesics<\/strong> Ibuprofen 400 mg three times a day (anti-inflammatory + painkiller) or acetaminophen 1 g three to four times a day for pain control. Opioids are rarely necessary but can be considered for very painful forms.<\/li>\n <li><strong>Contraindications to ototoxic drops if tympanic membrane is perforated:<\/strong> Drops containing neomycin + gentamicin + or alcohol are ototoxic if they reach the middle ear via a perforated eardrum \u2192 only use non-ototoxic drops (ciprofloxacin + ofloxacin) if a perforation is known or suspected + or if ventilation tubes are present<\/li>\n <li><strong>Systemic antibiotic therapy - limited indications:<\/strong> cellulitis extending beyond the ear canal (pinna + peri-auricular tissue) + large regional lymphadenopathy + fever + immunosuppression + diabetes (see malignant otitis externa) + failure of topical treatment after 7 days + oral ciprofloxacin 500 mg twice daily for 7\u201310 days (coverage of <em>P. aeruginosa<\/em>) or amoxicillin-clavulanate if a different agent is suspected<\/li>\n <li><strong>Recidivism prevention measures:<\/strong> Dry ears thoroughly after swimming (tilt head, cotton swab at entrance, hair dryer on low heat from a distance) + do not insert cotton swabs into the canal (worsens the situation) + custom earplugs for swimmers + a few drops of 70% isopropyl alcohol or acid-alcohol solution (white vinegar + alcohol) after swimming to restore the canal's acidic pH<\/li>\n <\/ul>\n\n <h2>Malignant (necrotizing) external otitis \u2014 an emergency in diabetics<\/h2>\n <ul class=\"co-list\">\n <li><strong>Definition and epidemiology:<\/strong> extension of otitis externa beyond the external auditory canal with invasion of temporal bone tissue (osteomyelitis of the skull base) + 90-95% % of cases occur in type 2 diabetics (microangiopathy + immunosuppression + neuropathy \u2192 insufficient local defenses) + remaining cases: severe immunosuppressed individuals (HIV + chemotherapy + prolonged corticosteroid therapy) + almost exclusive agent: <em>Pseudomonas aeruginosa<\/em><\/li>\n <li><strong>Warning signs of external otitis in diabetics:<\/strong> Persistent or worsening pain after 48\u201372 hours of topical treatment + severe nocturnal pain + facial paralysis (involvement of the facial nerve VII in its bony canal) + other cranial nerve palsies (VI + IX + X + XI + XII) \u2192 sign of extension at the jugular foramen + fever + altered general condition + granulation tissue in the canal at the bony floor (characteristic sign of malignant otitis)<\/li>\n <li><strong>Diagnosis :<\/strong> CT scan of the skull (thin-slice CT) \u2192 petrous bone erosion + MRI \u2192 extension to pericranial soft tissues + meningeal involvement + Tc-99m bone scan \u2192 early hyperfixation + 18F-FDG PET \u2192 better monitoring of infectious activity under treatment + biopsy + culture of granulation tissue from the canal (confirmation) <em>P. aeruginosa<\/em>)<\/li>\n <li><strong>Processing :<\/strong> hospitalization + IV ciprofloxacin 400 mg \u00d7 2\u20133\/day + or IV piperacillin-tazobactam for very severe forms + oral switch to ciprofloxacin 750 mg \u00d7 2\/day upon clinical improvement + minimum duration: 6 to 8 weeks + sometimes up to 3 months + strict glycemic control + limited surgical debridement (no extensive bone surgery in acute cases) + mortality reduced from 50% % to less than 10% % since the advent of fluoroquinolones<\/li>\n <\/ul>\n\n <div class=\"co-urgence\">\n <div class=\"co-urgence-titre\">Situations requiring urgent medical attention<\/div>\n <p>Consult the emergency department or ENT within 24 hours if external otitis in a diabetic or immunocompromised patient does not improve after 48\u201372 hours of treatment with drops + worsens + is accompanied by intense nocturnal pain + fever + facial weakness or paralysis (facial palsy) + or red fleshy tissue visible in the canal \u2014 these signs suggest malignant external otitis requiring urgent hospitalization, skull base imaging, and prolonged intravenous antibiotic therapy.<\/p>\n <p>For the treatment of otitis externa, prescribing ear drops appropriate to the tympanic status and referral to an ENT specialist for resistant or recurrent forms, Clinique Omicron offers medical consultations at its service points in Quebec and via telemedicine. To make an appointment, visit <a href=\"https:\/\/cliniqueomicron.ca\" style=\"color:#c0392b;font-weight:600;text-decoration:none;\">cliniqueomicron.ca<\/a>.<\/p>\n <\/div>\n\n <h2>Consult at Clinique Omicron<\/h2>\n <p>Clinique Omicron's physician assistants and nurse practitioners (PAs and NPs) diagnose and treat external otitis using the tragus sign and otoscopy. They prescribe appropriate antibiotic ear drops (ciprofloxacin + hydrocortisone, or ciprofloxacin alone if the eardrum is perforated), clean the ear canal if necessary, screen diabetic patients for signs of malignant external otitis, and refer patients to ENT specialists and emergency services for complicated cases. Consultations are available at several service points in Quebec and via telemedicine. To book an appointment, visit <a href=\"https:\/\/cliniqueomicron.ca\" style=\"color:#4D6577;font-weight:600;text-decoration:none;\">cliniqueomicron.ca<\/a>.<\/p>\n\n <p class=\"co-disclaimer\">The content of this page is for informational purposes only and does not replace the advice of a doctor or an otolaryngologist. In a diabetic patient, any external otitis resistant to initial treatment must be considered a potential malignant external otitis until proven otherwise, and requires urgent medical evaluation.<\/p>\n\n<\/div>\n<\/body>\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Otite externe : causes, sympt\u00f4mes, traitement et pr\u00e9vention | Clinique Omicron Oto-rhino-laryngologie & M\u00e9decine de famille Otite externe L’otite externe est une inflammation \u2014 le plus souvent d’origine infectieuse bact\u00e9rienne \u2014 du conduit auditif externe (CAE), c’est-\u00e0-dire du canal cartilagineux et osseux reliant le pavillon de l’oreille au tympan. Elle constitue l’une des affections ORL… <a href=\"https:\/\/cliniqueomicron.ca\/en\/otite-externe\/\" rel=\"bookmark\">Read More \"<span class=\"screen-reader-text\">External Otitis: Causes, Symptoms, Treatment, and Prevention | Clinique Omicron<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"_metasync_otto_title":"Otite externe : causes, sympt\u00f4mes, | Brossard | Clinique Omicron","_metasync_otto_description":"L'otite externe est une infection bact\u00e9rienne du conduit auditif externe. 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\n\t\t\t\t\t\n\n\n\n\nExternal Otitis: Causes, Symptoms, Treatment, and Prevention | Clinique Omicron<\/title>\n<meta name=\"description\" content=\"Otitis externa is an infection of the external ear canal causing pain with pressure on the tragus. Treatment with antibiotic ear drops, malignant otitis in diabetics, and prevention in Quebec.\">\n<meta name=\"keywords\" content=\"otite externe, otite externe traitement, otite externe sympt\u00f4mes, otite du baigneur, otite externe gouttes, otite externe diab\u00e8te, otite maligne externe, otite externe Pseudomonas, otite externe pr\u00e9vention, otite externe Qu\u00e9bec\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Cinzel:wght@600&family=Poppins:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Cinzel:wght@600&family=Poppins:wght@400;500;600;700&display=swap');\n\n.co-wrap * {\n font-family: 'Poppins', sans-serif;\n box-sizing: border-box;\n}\n.co-wrap {\n max-width: 1100px;\n margin: 0 auto;\n padding: 30px 0 60px;\n margin-top: 10px;\n}\n.co-label {\n font-family: 'Cinzel', serif;\n font-size: 14px;\n font-weight: bold;\n 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solid rgba(50,60,82,.15);border-left:4px solid #FF611C;border-radius:12px;background:#F4F6F8;font-family:Poppins,sans-serif}.oc-fiche-cta-t{font-size:18px;font-weight:600;color:#323C52;margin:0 0 4px;line-height:1.35}.oc-fiche-cta-x{font-size:15px;color:#4D6577;margin:0 0 14px;line-height:1.55}.oc-fiche-cta-b{display:flex;flex-wrap:wrap;gap:10px}.oc-fiche-cta-b a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;box-sizing:border-box}.oc-fiche-cta-b .oc-p{background:#FF611C;color:#fff}.oc-fiche-cta-b .oc-p:hover{background:#E04E0C}.oc-fiche-cta-b .oc-s{background:#fff;color:#323C52;border:1.5px solid rgba(50,60,82,.25)}@media (max-width:600px){.co-wrap h1{font-size:24px;line-height:1.25;text-transform:none}.oc-fiche-cta{padding:18px 16px}.oc-fiche-cta-b a{flex:1 1 100%}body .co-wrap > .co-table,body .co-wrap > .co-table tbody,body .co-wrap > .co-table tr,body .co-wrap > .co-table td{display:block;width:100%;box-sizing:border-box}body .co-wrap > .co-table{min-width:0;table-layout:auto}body .co-wrap > .co-table thead{display:none}body .co-wrap > .co-table tr{margin:0 0 10px;border:1px solid rgba(77,101,119,.18);border-radius:8px;overflow:hidden}body .co-wrap > .co-table td{padding:9px 12px;border:0}body .co-wrap > .co-table td:first-child{font-weight:600;color:#323C52;background:rgba(77,101,119,.07)}#ocw{transform:scale(.8);transform-origin:bottom right}}<\/style><div class=\"oc-fiche-cta\" data-oc-cta=\"fiche-haut-consult\"><p class=\"oc-fiche-cta-t\">Obtenir un avis adapt\u00e9 \u00e0 votre situation<\/p><p class=\"oc-fiche-cta-x\">Consultation en clinique ou en t\u00e9l\u00e9consultation, partout au Qu\u00e9bec.<\/p><div class=\"oc-fiche-cta-b\"><a class=\"oc-p\" href=\"https:\/\/cliniqueomicron.ca\/rendez-vous\/\">Make an appointment<\/a><a class=\"oc-s\" href=\"https:\/\/cliniqueomicron.ca\/consultation-en-ligne\/\">Consult online<\/a><a class=\"oc-s\" href=\"tel:+15146063350\">514 606-3350<\/a><\/div><\/div>\n\n\n <div class=\"co-intro\">\n Otitis externa is an inflammation - most often of infectious bacterial origin - of the external auditory canal (EAC), i.e. the cartilaginous and bony canal connecting the pinna to the eardrum. It is one of the most common ENT conditions in general practice, accounting for over 10 million consultations a year in North America, with a peak incidence in summer - hence its popular nickname of 'swimmer's ear\u00ab - due to exposure to water, which macerates the skin of the canal, altering the protective lipid film and raising the local pH, creating ideal conditions for bacterial proliferation. Its clinical presentation is characteristic: sharp, often intense ear pain, strikingly aggravated by pressure on the tragus (the small cartilaginous protrusion that protects the entrance to the ear canal) or by traction on the pinna - this sign of tragus pressure being pathognomonic of otitis externa, distinguishing it from acute otitis media (pain not aggravated by tragus pressure). <em>Pseudomonas aeruginosa<\/em> and <em>Staphylococcus aureus<\/em> are the most frequent bacterial pathogens, responsible for 90 % of infectious external otitis. Treatment essentially relies on antibiotic ear drops with or without corticosteroids (ciprofloxacin + hydrocortisone or neomycin + polymyxin B + hydrocortisone), whose superiority over systemic antibiotics for uncomplicated forms is well established, with cure rates of 85 to 95 % in 7 to 10 days. The most serious complication is malignant external otitis \u2014 also called necrotizing external otitis \u2014 which occurs almost exclusively in diabetics and immunocompromised individuals and in which the infection by <em>P. aeruginosa<\/em> extends beyond the external auditory canal to invade the temporal bone (skull base osteomyelitis), requiring prolonged systemic antibiotic therapy and urgent hospital management.\n <\/div>\n\n <h2>Pathophysiology and risk factors<\/h2>\n <ul class=\"co-list\">\n <li><strong>Natural defense mechanisms of the external ear canal:<\/strong> cerumen (wax) \u2192 acid-lipid film (pH 4-5) + antibacterial and antifungal properties (lysozyme + immunoglobulins + saturated fatty acids) + mechanical barrier against water and microorganism penetration + natural migration of the eardrum canal epithelium towards the acoustic meatus \u2192 natural self-cleaning + intact protective film \u2192 resistance to bacterial colonization<\/li>\n <li><strong>Factors that break down natural defenses:<\/strong> Water maceration (bathing + swimming + frequent showers) \u2192 cerumen denaturation + pH elevation + epithelial edema + microtrauma of the skin lining \u2192 entry point for bacteria + scratching and excessive cleaning with cotton swabs (detergent of protective cerumen + epidermal micro-lacerations + very frequent) + foreign bodies + hearing aids + headphones (obstruction + heat + local humidity) + atopic dermatitis + eczema (disruption of the skin barrier) + psoriasis<\/li>\n <li><strong>Pathogen agents<\/strong> <em>Pseudomonas aeruginosa<\/em> (38\u201365 % of cases) \u2192 Gram-negative aerobic bacterium ubiquitous in aquatic environments + thermotolerant + natural resistance to usual antibiotics + <em>Staphylococcus aureus<\/em> (15\u201325 %) + polymicrobial in 15\u201320 %of cases + fungi<em>Aspergillus niger<\/em> + <em>Candida albicans<\/em>) in 10\u201315 % of cases \u2192 otomycosis (common in the tropics + in recurrent external otitis + after prolonged topical antibiotic therapy)<\/li>\n <\/ul>\n\n <h2>Clinical presentation<\/h2>\n\n <table class=\"co-table\">\n <thead>\n <tr>\n <th>Clinical sign<\/th>\n <th>Description and characteristics<\/th>\n <th>Diagnostic value<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Ear pain (otalgia)<\/td>\n <td>Sharp pain, often intense, with a gradual onset over 1-2 days, localized to the ear canal. May radiate to the jaw, temple, or neck. Worsened by chewing, speaking, or the ear touching a pillow. Intensity varies from mild to severe, sometimes very debilitating.<\/td>\n <td>Cardinal sign of otitis externa + present in 100 % of cases<\/td>\n <\/tr>\n <tr>\n <td>Tragus sign (pathognomonic)<\/td>\n <td>Marked aggravation of pain on direct pressure on the tragus + or with gentle traction of the auricle upward and backward (stretching the cartilaginous canal) + no change with acute otitis media (AOM) \u2192 fundamental differential sign<\/td>\n <td>Positive tragus pressure sign = otitis externa until proven otherwise + sensitivity 80\u201395 % + specificity 90\u201395 % + the most informative sign in first-line otologic physical examination<\/td>\n <\/tr>\n <tr>\n <td>Otoscopy<\/td>\n <td>The external auditory canal is edematous and erythematous, often narrowed or partially obstructed, with skin debris and seropurulent or purulent secretions. The eardrum appears normal if visible (unlike AOM). There is sharp pain upon introduction of the speculum into the canal. Edema can make visualization of the eardrum impossible in severe cases.<\/td>\n <td>Allows confirmation of external otitis + visualization of the eardrum's condition (pre-existing perforation - contraindication for ototoxic drops) + pus sample if recurrent or resistant form for culture<\/td>\n <\/tr>\n <tr>\n <td>Ear itching<\/td>\n <td>Itching of the ear canal + often precedes pain in early forms + predominant in otomycosis and dermatological forms (eczema + psoriasis of the ear canal)<\/td>\n <td>Itching predominant over pain \u2192 consider otomycosis or ear canal dermatosis + itching alone without pain \u2192 may be contact dermatitis (ear drops + hearing aid)<\/td>\n <\/tr>\n <tr>\n <td>Hearing loss and blocked ear sensation<\/td>\n <td>Mild to moderate conductive hearing loss due to canal obstruction by edema and secretions + ear fullness sensation + possible tinnitus + resolves with healing<\/td>\n <td>Conductive hearing loss in otitis externa \u2192 blocked ear canal \u2192 tuning fork test: ipsilateral negative Rinne<\/td>\n <\/tr>\n <tr>\n <td>Peri-auricular lymphadenopathy<\/td>\n <td>Pretracheal, retroauricular, and high cervical adenopathy, mobile and painful to palpation, indicative of a significant local inflammatory reaction.<\/td>\n <td>Present in 25\u201340 % of moderate to severe forms + their presence indicates infection extending beyond the tract \u2192 consider systemic antibiotic therapy<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n\n <div class=\"co-infobox\">\n <span class=\"ico\">\u2139\ufe0f<\/span>\n <span>The essential clinical rule for distinguishing otitis externa from acute otitis media in the office: gently press on the tragus with a finger. If this significantly worsens the pain \u2192 otitis externa. If the pain is unchanged \u2192 acute otitis media (where the pain originates in the middle ear, not the canal). This simple maneuver takes 5 seconds and correctly guides treatment in 90 % of cases without requiring an otoscope.<\/span>\n <\/div>\n\n <h2>Treatment of uncomplicated forms<\/h2>\n <ul class=\"co-list\">\n <li><strong>Ear canal cleaning (essential preliminary step):<\/strong> removal of debris + secretions by gentle syringe or bulb suction + or gentle irrigation with warm saline if the eardrum is intact + or careful wiping with a gauze wick soaked in antiseptic solution (boric acid + alcohol + or Burow's solution) + a clean canal significantly increases the effectiveness of ear drops + do not instill drops into a canal blocked by debris<\/li>\n <li><strong>Antibiotic ear drops with corticosteroid - standard treatment:<\/strong> ciprofloxacin + hydrocortisone (Cipro HC\u00ae \u2014 Cilodex\u00ae) 4 drops \u00d7 2\/day \u00d7 7 days OR neomycin + polymyxin B + hydrocortisone (Cortisporin\u00ae otic) 3\u20134 drops \u00d7 3\u20134\/day \u00d7 7\u201310 days + the presence of a corticosteroid reduces inflammation + edema + pain + accelerates healing + ciprofloxacin is the only topical antibiotic active against <em>Pseudomonas<\/em> available as ear drops + drops can be gently warmed before instillation (reduce dizziness) + lie on your side with the treated ear facing up for 2-3 minutes after instillation + pull the earlobe up and back to straighten the canal (adult)<\/li>\n <li><strong>Ear wick if ear canal is narrow<\/strong> If the swelling obstructs the canal and prevents the drops from reaching the depth \u2192 insertion of a cotton or gauze wick soaked in antibiotic drops + allows drainage + promotes drug penetration into the stenosed canal + to be removed after 24-48 hours<\/li>\n <li><strong>Systemic analgesics<\/strong> Ibuprofen 400 mg three times a day (anti-inflammatory + painkiller) or acetaminophen 1 g three to four times a day for pain control. Opioids are rarely necessary but can be considered for very painful forms.<\/li>\n <li><strong>Contraindications to ototoxic drops if tympanic membrane is perforated:<\/strong> Drops containing neomycin + gentamicin + or alcohol are ototoxic if they reach the middle ear via a perforated eardrum \u2192 only use non-ototoxic drops (ciprofloxacin + ofloxacin) if a perforation is known or suspected + or if ventilation tubes are present<\/li>\n <li><strong>Systemic antibiotic therapy - limited indications:<\/strong> cellulitis extending beyond the ear canal (pinna + peri-auricular tissue) + large regional lymphadenopathy + fever + immunosuppression + diabetes (see malignant otitis externa) + failure of topical treatment after 7 days + oral ciprofloxacin 500 mg twice daily for 7\u201310 days (coverage of <em>P. aeruginosa<\/em>) or amoxicillin-clavulanate if a different agent is suspected<\/li>\n <li><strong>Recidivism prevention measures:<\/strong> Dry ears thoroughly after swimming (tilt head, cotton swab at entrance, hair dryer on low heat from a distance) + do not insert cotton swabs into the canal (worsens the situation) + custom earplugs for swimmers + a few drops of 70% isopropyl alcohol or acid-alcohol solution (white vinegar + alcohol) after swimming to restore the canal's acidic pH<\/li>\n <\/ul>\n\n <h2>Malignant (necrotizing) external otitis \u2014 an emergency in diabetics<\/h2>\n <ul class=\"co-list\">\n <li><strong>Definition and epidemiology:<\/strong> extension of otitis externa beyond the external auditory canal with invasion of temporal bone tissue (osteomyelitis of the skull base) + 90-95% % of cases occur in type 2 diabetics (microangiopathy + immunosuppression + neuropathy \u2192 insufficient local defenses) + remaining cases: severe immunosuppressed individuals (HIV + chemotherapy + prolonged corticosteroid therapy) + almost exclusive agent: <em>Pseudomonas aeruginosa<\/em><\/li>\n <li><strong>Warning signs of external otitis in diabetics:<\/strong> Persistent or worsening pain after 48\u201372 hours of topical treatment + severe nocturnal pain + facial paralysis (involvement of the facial nerve VII in its bony canal) + other cranial nerve palsies (VI + IX + X + XI + XII) \u2192 sign of extension at the jugular foramen + fever + altered general condition + granulation tissue in the canal at the bony floor (characteristic sign of malignant otitis)<\/li>\n <li><strong>Diagnosis :<\/strong> CT scan of the skull (thin-slice CT) \u2192 petrous bone erosion + MRI \u2192 extension to pericranial soft tissues + meningeal involvement + Tc-99m bone scan \u2192 early hyperfixation + 18F-FDG PET \u2192 better monitoring of infectious activity under treatment + biopsy + culture of granulation tissue from the canal (confirmation) <em>P. aeruginosa<\/em>)<\/li>\n <li><strong>Processing :<\/strong> hospitalization + IV ciprofloxacin 400 mg \u00d7 2\u20133\/day + or IV piperacillin-tazobactam for very severe forms + oral switch to ciprofloxacin 750 mg \u00d7 2\/day upon clinical improvement + minimum duration: 6 to 8 weeks + sometimes up to 3 months + strict glycemic control + limited surgical debridement (no extensive bone surgery in acute cases) + mortality reduced from 50% % to less than 10% % since the advent of fluoroquinolones<\/li>\n <\/ul>\n\n <div class=\"co-urgence\">\n <div class=\"co-urgence-titre\">Situations requiring urgent medical attention<\/div>\n <p>Consult the emergency department or ENT within 24 hours if external otitis in a diabetic or immunocompromised patient does not improve after 48\u201372 hours of treatment with drops + worsens + is accompanied by intense nocturnal pain + fever + facial weakness or paralysis (facial palsy) + or red fleshy tissue visible in the canal \u2014 these signs suggest malignant external otitis requiring urgent hospitalization, skull base imaging, and prolonged intravenous antibiotic therapy.<\/p>\n <p>For the treatment of otitis externa, prescribing ear drops appropriate to the tympanic status and referral to an ENT specialist for resistant or recurrent forms, Clinique Omicron offers medical consultations at its service points in Quebec and via telemedicine. To make an appointment, visit <a href=\"https:\/\/cliniqueomicron.ca\" style=\"color:#c0392b;font-weight:600;text-decoration:none;\">cliniqueomicron.ca<\/a>.<\/p>\n <\/div>\n\n <h2>Consult at Clinique Omicron<\/h2>\n <p>Clinique Omicron's physician assistants and nurse practitioners (PAs and NPs) diagnose and treat external otitis using the tragus sign and otoscopy. They prescribe appropriate antibiotic ear drops (ciprofloxacin + hydrocortisone, or ciprofloxacin alone if the eardrum is perforated), clean the ear canal if necessary, screen diabetic patients for signs of malignant external otitis, and refer patients to ENT specialists and emergency services for complicated cases. Consultations are available at several service points in Quebec and via telemedicine. To book an appointment, visit <a href=\"https:\/\/cliniqueomicron.ca\" style=\"color:#4D6577;font-weight:600;text-decoration:none;\">cliniqueomicron.ca<\/a>.<\/p>\n\n <p class=\"co-disclaimer\">The content of this page is for informational purposes only and does not replace the advice of a doctor or an otolaryngologist. In a diabetic patient, any external otitis resistant to initial treatment must be considered a potential malignant external otitis until proven otherwise, and requires urgent medical evaluation.<\/p>\n\n<\/div>\n<\/body>\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Otite externe : causes, sympt\u00f4mes, traitement et pr\u00e9vention | Clinique Omicron Oto-rhino-laryngologie & M\u00e9decine de famille Otite externe L’otite externe est une inflammation \u2014 le plus souvent d’origine infectieuse bact\u00e9rienne \u2014 du conduit auditif externe (CAE), c’est-\u00e0-dire du canal cartilagineux et osseux reliant le pavillon de l’oreille au tympan. Elle constitue l’une des affections ORL… <a href=\"https:\/\/cliniqueomicron.ca\/en\/otite-externe\/\" rel=\"bookmark\">Read More \"<span class=\"screen-reader-text\">External Otitis: Causes, Symptoms, Treatment, and Prevention | Clinique Omicron<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"_metasync_otto_title":"Otite externe : causes, sympt\u00f4mes, | Brossard | Clinique Omicron","_metasync_otto_description":"L'otite externe est une infection bact\u00e9rienne du conduit auditif externe. 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