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Hives also known as urticaria is a skin reaction that causes itchy welts, which can range in size from small spots to large blotches several inches in diameter. Hives can be triggered by exposure to certain foods, medications or other substances. Angioedema is a related type of swelling that affects deeper layers in your skin, often around your eyes and lips. In most cases, hives and angioedema are harmless and don't leave any lasting marks, even without treatment.
The welts associated with hives can be: Red or flesh-colored, Intensely itchy, Roughly oval or shaped like a worm, A few millimeters to several inches across, Most hives go away within 24 hours. Chronic hives can last for months or years.
Treatments for hives and angioedema may include: Antihistamines, Corticosteroids, Autoimmune drugs, Blood protein controllers.