Problem: Swimmer's ear is an inflammation of the ear canal that's caused when water, sand, or other debris accumulate and cause the growth of bacteria or fungus, according to Everyday Health.
Solved: Keep ears dry by gently tipping the head from side to side after each swim. Dry the outer ear with a soft towel or cloth to get rid of any residual water. The Mayo Clinic suggests applying a teaspoon of a homemade solution of one part white vinegar and one part rubbing alcohol to each ear to facilitate drying and help prevent the growth of bacteria. The pediatrician can also prescribe medicated ear drops if the damage is already done.