Dermographism is common, and means that one can, for example, write letters on the skin with a sharp object and the letters become visible immediately afterwards. The color is redder or paler than the surrounding skin, and often there is a palpable elevation in the skin. Dermographism occurs quickly and typically disappears after an hour. It is most common in adolescents and young adults.
Mechanical pressure on the skin causes signaling substances (for example histamine) to be released from the skin's mast cells. Signal substances cause fluid to leak out of the smallest blood vessels in the skin. It is only the liquid in the blood that leaks out, and not the "large" blood cells. There is an accumulation of fluid in the skin, a swelling, which lifts the epidermis up a little. In addition, the signaling substances can affect the nerves in the skin so that you experience itching. Dermographism is similar to hives (urticaria), and can occur together with hives or as a separate phenomenon.
Treatment is usually not necessary. Some people only have this for a shorter period during their life, and it causes little trouble. In those who have a lot of itching or get it easily, treatment with antihistamine tablets can often reduce the tendency to dermographism.
Our dermatologists help people of all ages, from newborns to the elderly, with everything from simple skin changes to serious conditions.
Our dermatologists help people of all ages, from newborns to the elderly, with everything from simple skin changes to serious conditions.
