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Solar urticaria induced by ultraviolet A light

(A) Shoulder before sun exposure.
(B) Shoulder after 15 minutes of sun exposure through a glass window. The glass window filters out ultraviolet B light.

Reproduced with permission from: Goodheart HP. Goodheart's Photoguide of Common Skin Disorders, 2nd Edition. Philadelphia: Lippincott Williams & Wilkins, 2003. Copyright © 2003 Lippincott Williams & Wilkins.

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