MedlinePlus Medical Encyclopedia: Polymorphic light eruption

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Polymorphic light eruption

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Illustrations Alternative names	Definition

Illustrations

Polymorphic light eruption on the arm

Alternative names Return to top

Polymorphous light eruption

Definition Return to top

Polymorphic light eruption is a common reaction to sunlight (ultraviolet light) that occurs in "light-sensitive" individuals. Small red pimples and blisters appear on the skin within 1 to 4 days after exposure to sunlight.

They disappear within 2 weeks. The cause is unknown. Some experts think it is a type of delayed allergic reaction. Controlled ultraviolet light exposure may reduce some of the symptoms.

Update Date: 10/27/2003

Updated by: Jeffrey Drayer, M.D., Dermatologist, Los Angeles, CA. Review provided by VeriMed Healthcare Network.

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