Slide show: Poison ivy and other summer skin irritants
Photo of polymorphous light eruption (PMLE)
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Polymorphous light eruption (PMLE) is a rash that occurs as a result of sensitivity to sunlight (photosensitivity). Within hours of sun exposure — usually in the spring or early summer — you may notice an itchy, red rash. The spots occur most often on the front of the neck and chest as well as the arms and thighs.

PMLE usually resolves on its own within a few days, although the condition can recur. In the meantime, limit sun exposure. Ease any discomfort with a cool compress or an over-the-counter anti-itch cream, such as hydrocortisone cream. Consult your doctor if the reaction is severe or painful.

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