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Swimmer's itch (cercarial dermatitis) is a burning or itchy rash caused by an allergic reaction to a waterborne parasite that burrows into the top layer of skin. The parasites soon die, but you're temporarily left with tiny bumps or blisters.

Swimmer's itch isn't serious and usually clears up on its own within a week. At-home remedies — soothing lotions, lukewarm baths with colloidal oatmeal or baking soda — may ease the itchiness.

Sept. 28, 2019