Otitis Externa (Swimmer's Ear)
Acute Bacterial Infection of the External Auditory Canal
Primary risk age: Children and Teens (particularly active swimmers)
- Urgency
- Mild
- Typical age
- Children and Teens (particularly active swimmers)
- Body system
- Ear, Nose & Throat (ENT)
Typical course: 7 to 10 days for complete resolution.
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
Acute Bacterial Infection of the External Auditory Canal
Pathophysiology (Development Path)
Retention of water in the ear canal leads to maceration of the skin and breakdown of the protective cerumen barrier. This creates an alkaline environment that favors bacterial proliferation, leading to acute inflammation, edema, and exquisite pain.
Primary Causes & Etiology
Pseudomonas aeruginosa or Staphylococcus aureus infection, favored by moisture retention in the ear canal or minor trauma (cotton swabs).
2. Symptom Continuum
- Early Onset Signs
Mild itching inside the ear canal, slight redness of the outer ear, and mild discomfort.
- Progressive Phase
Severe ear pain, exacerbated by pulling the pinna or pushing the tragus; swelling of the ear canal; and yellowish discharge.
- Severe Indicators
Complete occlusion of the ear canal by swelling, fever, localized lymphadenopathy, and spreading cellulitis of the face or neck.
3. Clinical Verification
Otoscopic examination showing erythema, edema, and purulent debris in the external auditory canal. Exquisite pain on movement of the pinna.
4. Care & Elements Plan
Primary Care Treatment Plan
Thorough cleaning of the canal if obstructed. Topical antibiotic ear drops (often combined with a corticosteroid to reduce swelling). Keep the ear dry.
Home Support Elements
Apply warm compresses for pain relief. Ensure no water enters the ear canal during bathing (use earplugs or a cotton ball coated in petroleum jelly).
Generic Active Ingredients (No Brands)
- Ciprofloxacin-Dexamethasone ear drops (active bacterial and anti-inflammatory ingredients).
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
Consult if there is severe ear pain, spreading redness on the outer ear, high fever, or if ear drops cannot be instilled due to swelling.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Dry ears thoroughly after swimming using a towel or hair dryer on a low setting. Use drying drops (isopropyl alcohol/white vinegar) after swimming.
Immunization Context
Not applicable.
7. Timelines & Outlook
Active Timeline
7 to 10 days for complete resolution.
Expected Prognosis
Excellent. Swift resolution within 3 to 5 days of initiating topical antibiotic drops.
Potential Untreated Complications
Malignant otitis externa (rare in children), spreading cellulitis, and temporary hearing loss due to canal occlusion.
More in Auditory Apparatus & Tympanic Inflammations
Moderate Acute Otitis Media (AOM)
Acute Suppurative Middle Ear Infection
6 Months to 2 Years (Peak incidence due to Eustachian tube anatomy)
Mild Otitis Media with Effusion (OME)
Non-Infectious Middle Ear Fluid Accumulation
2 to 5 Years (Peak occurrence as Eustachian tubes mature)
Severe Mastoiditis
Acute Coalescent Mastoid Osteitis
6 Months to 3 Years (Most common under 2 years)