Otitis externa: a rationale for treatment.

Acute diffuse otitis externa due to Pseudomonas (swimmer's ear) is a common summer problem which may be empirically (and inadequately) treated. Rational treatment is based upon accurate diagnosis of the etiology of the inflammation, and meticulous treatment of the ear canal. The type of ear drop seems less important than the technique of its application and physical management of the inflamed canal itself. A rational regime of therapy is outlined and side effects of drops discussed with complications of the disease itself.