Slide show: Poison ivy and other summer skin irritants
Photo of polymorphous light eruption
Previous Next 5 of 9 Polymorphous light eruption

Polymorphous light eruption 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 might notice an itchy, red rash in sun-exposed areas. The spots occur most often on the upper chest, neck and the back of the arms.

The rash usually resolves on its own within a few days, although the condition can recur. In the meantime, limit sun exposure and wear sun-protective clothing and sunscreen. An over-the-counter anti-itch cream, such as hydrocortisone cream, might help ease discomfort. Consult your doctor if the reaction is severe or painful.

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