Treatment of Otitis Externa

Initial Assessment and Diagnosis

The American Academy of Otolaryngology-Head and Neck Surgery suggests that otitis externa involves inflammation of the external auditory canal, with physical examination findings including tenderness of the tragus and/or pinna, diffuse ear canal edema and erythema, normal tympanic membrane mobility on pneumatic otoscopy, and possible otorrhea or debris in the ear canal 2
Pneumatic otoscopy is crucial for differentiation between otitis media and otitis externa, with good tympanic membrane mobility suggesting otitis externa 2
Location of pain/tenderness is important for diagnosis, with otitis externa characterized by pain with manipulation of the tragus or pinna 2

Topical antimicrobial therapy is recommended as first-line treatment for uncomplicated acute otitis externa (AOE), targeting common pathogens such as Pseudomonas aeruginosa and Staphylococcus aureus 1
Aural toilet (cleaning) should be performed before administering drops to ensure medication reaches infected tissues, including gentle suction, dry mopping, irrigation, or removal of obstructing debris 1

Pain assessment and management is essential in AOE, with pain typically improving within 48-72 hours of starting treatment 1
Analgesic treatment should be based on the severity of pain, according to the American Academy of Otolaryngology-Head and Neck Surgery 3

Fungal otitis externa (otomycosis) is suspected if otoscopy reveals white debris sprouting hyphae (Candida) or a moist white plug dotted with black debris resembling "wet newspaper" (Aspergillus niger), and treatment includes thorough debridement of the ear canal and topical antifungal therapy 3
Necrotizing (malignant) otitis externa is suspected if otoscopy reveals granulation tissue on the floor of the canal and at the bony-cartilaginous junction, especially in elderly, diabetic, or immunocompromised patients, and treatment includes surgical debridement and systemic antibiotics adequate to cover pseudomonal and staphylococcal infection 3

Oral antibiotics should NOT be used as initial therapy for uncomplicated otitis externa, but may be reserved for specific circumstances such as extension of infection beyond the ear canal, patients with diabetes or immunocompromised status, or when topical therapy cannot reach the infected area or has failed 1

Reassess patients within 48-72 hours if no improvement is seen, and reasons for treatment failure may include inadequate drug delivery due to canal obstruction, poor adherence to therapy, incorrect diagnosis, fungal infection, or contact dermatitis from topical agents 1