11/26/2023 0 Comments U he hive skinsIt is not known what the trigger is in about half of cases. The chemicals also cause the blood vessels to open wide (dilate) which causes the flare around the weals. The chemicals cause fluid to leak from tiny blood vessels under the skin surface. ![]() When you have hives (urticaria), you have an itchy rash caused by tiny amounts of fluid that leak from blood vessels just under the skin surface.Ī trigger causes cells in the skin to release chemicals such as histamine.
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