Solar urticaria induced by ultraviolet A light

(A) Chest before sun exposure.

(B) Chest 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.