Otitis externa is an inflammation and/or infection of the ear canal. The ear canal is the tube leading from the outer ear to the eardrum. Because it is often found in swimmers, particularly in warm, humid climates, it is often referred to as swimmer’s ear.

The Ear Canal
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Otitis externa is caused by infection, chemical irritation, or trauma. Trauma causes damage to the ear canal, which may cause inflammation or allow infection to invade.