Slide show: Poison ivy and other summer skin irritants
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Swimmer's itch 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. While you swim, the parasites might burrow into your skin. The parasites soon die — and you're left with itchy, red, raised spots on your skin.

Swimmer's itch is usually mild and resolves on its own within a week. In the meantime, control itching with an over-the-counter anti-itch cream, such as hydrocortisone cream. However, if initial itching is severe, scratching can cause abrasions and skin infections. Consult your doctor if symptoms persist longer than three days.

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