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Hives, also known as urticaria, are itchy, raised welts that are found on the skin. They are usually red, pink, or flesh-colored, and sometimes they sting or hurt. In most cases, hives are caused by an allergic reaction to a medication or food or a reaction to an irritant in the environment.
About Hives (urticaria). We explain the hives, the most common causes, symptoms, body parts most likely affected, treatment, & tips for controlling urticaria. The hives (urticaria) is a harmless type of rash or skin allergy that is usually caused by an allergy.The rash consists of circular, raised welts on the skin that are usually itchy and occur in batches. Hives can vary in size, from a few millimeters to several centimeters in diameter.he most common skin allergy triggers that cause hives include: â¢ Medication such as antibiotics, codeine, penicillin, sulfa, anticonvulsant drugs, phenobarbital, and aspirin. â¢ Foods like shellfish, nuts, tomatoes, soy, chocolate, and berries. â¢ Pollen.