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Hives Definition. Hives (also called urticaria) is a condition that causes a noticeable skin rash with itchy, raised, pale red bumps. Hives are the result of allergic triggers in most cases. Other names for hives include welts, nettle rash, wheals, heat rash. There are 2 classifications of hives: acute and chronic.
An allergic reaction to medicine can cause hives. They appear as raised, red, itchy bumps (wheals) of different shapes and sizes, with defined red margins and pale centers. Hives may appear and then disappear at random and seem to move from place to place on the skin.