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 - 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: 4/16/2007

Updated by: Michael S. Lehrer, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.

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