Swimmers' itch

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Definition Symptoms Causes Risk factors When to seek medical advice

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Definition

Swimmers' itch, also known as cercarial dermatitis, is an itchy rash caused by certain parasites that normally live on waterfowl and freshwater snails. On warm, sunny days — especially in calm freshwater lakes or ponds — these parasites can be released into the water. During a swim, these parasites might burrow into your skin. They soon die and cause an itchy rash.

Swimmers' itch has been reported in countries throughout the world, leading to various nicknames with a national or regional twist. Swimmers off the coast of New Jersey may call it "duckworms." People in Asian countries might use the term "rice paddy itch."

Although uncomfortable, swimmers' itch is usually short-lived. The rash typically clears up on its own within a few days. In the meantime, you can control itching with over-the-counter or prescription medications.

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Symptoms