Otitis externa

Infections of the outer ear
External ear infection
A disorder in which there is infection, inflammation or irritation of the external ear and ear canal. There is often a history of recent exposure to water or mechanical ear trauma from scratching or foreign objects in the ear. Swimming in polluted water is one way to contract swimmer's ear.
Otitis externa is fairly common, affecting 4 out of 1,000 people, mostly teenagers and young adults.
(E) Emanations of other problems