Medicines for Dermographism

What it is

Dermographism (literally "skin writing") is a common and harmless condition in which firmly stroking, scratching or applying pressure to the skin causes raised, red or discoloured, itchy welts (like hives) to appear along the line of contact, usually within a few minutes. It is a type of physical urticaria (hives triggered by a physical stimulus), where the skin's mast cells release histamine in response to the pressure. The welts typically fade within about half an hour to an hour. It can be brought on by everyday things such as scratching an itch, tight clothing, towel-drying, or a watch strap, and it can be itchy and annoying, sometimes setting up an itch-scratch cycle. It is usually not a sign of any serious underlying condition and is not dangerous or contagious. Many people have a mild degree of it. It can come and go over time, and sometimes lasts months to years before settling. Because it is harmless, understanding what it is often provides reassurance.

How it is treated

Dermographism is usually easily managed, and reassurance that it is harmless is an important part of care. For symptoms, the mainstay is antihistamines, which reduce the itching and the tendency to form welts; taking them regularly (sometimes at a higher dose under medical advice) can keep symptoms well controlled for people who are troubled by it, and it is not always necessary to take them if symptoms are mild. Avoiding triggers where possible helps — such as not scratching (which perpetuates it), avoiding tight or rough clothing, using gentle skin care, and keeping the skin moisturised. Because it is harmless and often mild, many people need little or no treatment. If dermographism is severe, persistent, or troublesome despite antihistamines, or occurs with other symptoms, a doctor can advise, and occasionally further assessment or treatment is needed. The reassuring message is that dermographism is common, harmless, and usually well controlled with antihistamines and avoiding triggers.