Ear Pus (Otorrhea) + Pain (Otalgia) + Itching (Pruritus)

The triad of ear discharge, pain, and itching points to otitis externa (OE) as the most common diagnosis, though otitis media with perforation must also be considered. Here is a structured breakdown:

Types of Otitis Externa

The combination of these three symptoms fits the spectrum of otitis externa, which affects up to 10% of all persons during their lifetimes.

Type	Key Features	Common Pathogen
Acute Diffuse OE (Swimmer's Ear)	Severe otalgia, itching, purulent discharge, hearing loss	Pseudomonas aeruginosa (most common)
Acute Localized OE	Itching, pain, swelling, small pustule/furuncle in canal	Staphylococcus aureus
Fungal OE (Otomycosis)	Intense itching, clear/white discharge, "cotton-like" debris, hyphae visible	Aspergillus, Candida
Chronic OE	Mild discomfort, flaking, itching, prolonged course	Mixed bacteria + fungi
Eczematous OE	Severe itching, scaling, crusting, oozing	Contact/seborrhoeic/atopic dermatitis
Malignant (Necrotizing) OE	Progressive pain unresponsive to drops, granulation tissue, cranial nerve palsies	P. aeruginosa (in diabetics, immunocompromised)

- Cummings Otolaryngology Head and Neck Surgery; Textbook of Family Medicine 9e

Pathophysiology

The external auditory canal (EAC) normally has a slightly acidic pH and a self-cleaning mechanism. Disruption of these defenses leads to infection:

Moisture (swimming, sweating) raises the canal pH and softens skin
Trauma (cotton buds, hearing aids, earphones) disrupts the skin barrier
Predisposing skin conditions: eczema, seborrhoea, psoriasis
Narrow canal (congenital, exostoses) traps moisture

In acute bacterial OE: early infection causes pruritus and erythema with clear discharge; as it worsens, discharge becomes seropurulent, canal swells, and pain intensifies. Pain is characteristically worsened by pulling the pinna or pressing the tragus.

Microbiology

Bacterial infections: >90% of acute cases
Most common organisms: P. aeruginosa > S. epidermidis > S. aureus
Fungal OE (Aspergillus, Candida): <2% of acute cases, but more likely after antibiotic treatment
Fungal infection shows "wet newspaper" appearance with Aspergillus (white plug + black dots)

Clinical Images

Chronic otitis externa - showing atrophy and stenosis of canal skin:

Chronic otitis externa - atrophy and stenosis of canal skin

Otomycosis (Aspergillus flavus) - florid fungal infection with tufts of fungus and white conidiophores:

Otomycosis - Aspergillus flavus with white conidiophores

- Cummings Otolaryngology Head and Neck Surgery

Management

General / Preventive

Occlusive earplugs during swimming
Stop cotton-tipped applicators - they cause trauma and worsen inflammation
Keep ears dry; hair dryer on low setting can help

Acute Bacterial OE - First Line

Topical antibiotic + steroid drops are the treatment of choice
- Fluoroquinolone drops (e.g., ciprofloxacin/ofloxacin): preferred, safe even if TM perforation suspected
- Aminoglycosides (e.g., neomycin/gentamicin): effective but ototoxic - avoid if TM may be perforated; also risk of contact hypersensitivity
- Addition of a corticosteroid to topical antibiotics improves symptoms
Acetic acid (50% diluted) irrigation can be effective in early/mild AOE
Debridement of the canal is an important adjunct - removes debris, improves penetration of drops
If canal is too swollen for drops to penetrate: insert a wick (Merocel sponge or cotton strand)

Systemic Antibiotics

NOT indicated in immunocompetent patients with uncomplicated OE
Reserved for: cellulitis extending to the pinna, or immunocompromised patients

Fungal OE (Otomycosis)

Stop antibiotic drops (they promote fungal overgrowth)
Meticulous cleaning and debridement
Antifungal drops (clotrimazole, acetic acid)
A recent 2026 meta-analysis (PMID: 41373129) reviewed RCTs on otomycosis management and supports this approach

Chronic OE

Treat the underlying dermatitis
Remove inciting factors (shampoos, hearing aid molds, ear buds)
Topical steroids to reduce inflammation
Meticulous cleaning under microscopy in clinic

- Rosen's Emergency Medicine; Bailey and Love's Surgery 28e; Cummings Otolaryngology

Red Flags - When to Refer Urgently

Red Flag	Concern
Diabetic or immunocompromised patient with persistent OE not responding to drops	Necrotizing (Malignant) OE - skull base osteomyelitis
Facial nerve palsy (VII), hoarseness, dysphagia	Cranial nerve involvement in malignant OE
Granulation tissue in the canal floor	Malignant OE
Previous radiotherapy to head/neck	Compromised healing

Malignant OE requires CT scanning to assess bony erosion, MRI with gadolinium for soft tissue/intracranial extension, aggressive surgical debridement, and systemic anti-pseudomonal antibiotics (e.g., ciprofloxacin orally or IV). It carries high mortality if missed.

Otitis Media with Perforation - also consider

If there is a central perforation of the tympanic membrane, middle ear discharge will also appear at the ear canal. This is distinguished from OE by:

Discharge is typically mucoid/mucopurulent rather than seropurulent
Pain and itching are less prominent compared to OE
No pain on tragal pressure (unlike OE)
Visible perforation on otoscopy

Bottom line for practice: Most cases of ear pus + pain + itching are acute bacterial otitis externa managed with topical antibiotic-steroid drops. Avoid aminoglycoside drops if TM perforation is possible. Always check for diabetes or immunocompromise, and refer early if the condition does not respond to topical treatment.

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