What is it call when you get welts every time you itch?

The condition where welts appear every time you itch is known as dermographism or dermatographic urticaria. It occurs when the skin reacts to light scratching or pressure, leading to raised, itchy welts. This response is due to the release of histamines in the skin, which can be triggered by various factors, including stress or temperature changes. Treatment often involves antihistamines to reduce symptoms.