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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.
Hives are raised bumps, called welts or wheals, on the skin. Hives can be small or large and can occur anywhere on the body. Hives are itchy. Hives can occur due to an acute allergic reaction to an allergen. Hives can be one sign of an allergic reaction or hives can be one of many signs of an allergic reaction. Hives can occur during severe allergic reactions known as anaphylaxis (anna-fih-LACK-sis).