Chronic idiopathic urticaria or hives is an autoimmune disorder that causes itchy and red bumps on the skin surface. Antihistamines, oral corticosteroids, and immunosuppressant drugs are used in the treatment.
Urticaria - Causes and Treatment
Urticaria is a skin condition characterized by itchy wheals or hives over the body. The below article details the same.

Urticaria - a Frequently Occurring Skin Disease
Urticaria or hives is a common condition. This article discusses in detail the common causes and management of urticaria.