Hives (Urticaria)

Hives are characterized as itchy red, raised welts (also known as wheals) on the skin's surface that can spread or join together and form larger areas of raised lesions. They are generally triggered by exposure to an allergen or chemical irritant. They tend to appear suddenly and often disappear equally as suddenly.

Hives are usually an allergic reaction to food, medicine, or animals. They can also be triggered by sun exposure, stress, excessive perspiration, or other, more serious diseases like lupus. Anyone can get hives. They are harmless and non-contagious. Hives may itch, burn, or sting. They rarely need medical attention as they tend to disappear on their own. However, in persistent cases, your dermatologist may prescribe antihistamines or oral corticosteroids. The best way to prevent hives is to discontinue exposure to allergic irritants.

Hives lasting more than six weeks are known as chronic urticaria or swelling below the skin's surface, angioedema. There are no known causes of angioedema, but it can affect internal organs and require medical attention.