Dermatographia, also known as "skin writing," is a fascinating condition in which even light pressure or scratching of the skin causes raised red marks that mimic hives. It is believed that dermatographia is caused by the release of histamine from mast cells in the skin, leading to localized swelling and redness. It is a form of physical urticaria and typically resolves within 30 minutes to an hour.
医学生Medic[超话]
