Urticaria, also known as hives, is a skin condition characterized by itchy, raised welts on the skin. These welts can be red, pink, or flesh-colored and vary in size and shape. Urticaria can be caused by an allergic reaction to food, medication, insect bites, or other triggers. It can also be caused by physical factors such as pressure, heat, or cold. In some cases, the cause of urticaria is unknown. Treatment for urticaria may include over-the-counter antihistamines to reduce itching and swelling, prescription medications such as corticosteroids or immunosuppressants for severe cases, and avoidance of triggers. In most cases, urticaria clears up on its own within a few days or weeks, but for some people, it can be a chronic condition that requires ongoing management.