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You can get swimmer's ear when bacteria or fungus grows in your ear canal. This happens when water, sand, or other small debris irritates the delicate skin in the ear canal. Other things that can irritate the ear canal include hearing aids, lots of ear cleaning, and eczema of the ear canal.
Swimmer's ear is more likely if you have a very narrow or hairy ear canal; live in a warm, humid climate; have little or no earwax; have lots of ear infections; or have eczema or dry skin. If you have had swimmer's ear in the past, you are more likely to get it again.