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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.
Urticaria, commonly called hives, is an inflammation of the surface layers of the skin, and is characterized by small, itchy red or white welts (called wheals). Urticaria is usually caused by an allergic reaction; however, the allergenic trigger is often unknown.