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Localized or diffuse lesions develop superficially but may be associated with edematous reactions in the deep subcutaneous tissue (angioedema).
Most episodes of urticaria last less than six weeks (acute urticaria), while a "rash that persists for a longer time characterizes the chronic form."
Hives can be caused by a number of causes, including allergic reactions, insect bites, emotional stress, exercise, and freezing temperatures.
Many cases of urticaria do not need specific treatment, as the rash often resolves spontaneously within a few days. If the itching and swelling are extremely bothersome, antihistamines can help relieve them, while more severe cases of urticaria can require a short course of oral corticosteroids.
(cells that play an important role in the immune system), resulting in an inflammatory reaction. Urticaria can be acute (temporary) or chronic (lasting or relapsing).
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