ABSTRACT
Solar urticaria is an uncommon type of physical urticaria; the action spectrum ranges from UVB to visible light. Urticaria is an extremely common disease that appears in 15% to 20% of the general population at some time in their lives. Among them, however, solar urticaria is a relatively rare type of physical urticaria. The diagnosis of solar urticaria can be easily made from its characteristic features, although the causative factors, similar to other types of urticaria, are rarely found. Patients with solar urticaria have been reported throughout the world without specific racial and geographic limitations. Solar urticaria develops at the site of exposure to sunlight usually within a few minutes. Very rarely, it may appear a few hours after irradiation. In summer, solar urticaria may develop on covered parts of the body as a result of small amounts of Ultraviolet radiation or visble light penetrating thin clothing. Solar urticaria may be an autoimmune disease, which is induced by endogenous factors.
