Hello, would you talk to me a little more about dermatographism?

Write on skin: It means write on the skin and is a type of hive where there is swelling with touch, scratching, pressure. It causes selling when Mast cells in the skin release histamine. It is a mechanical issue rather than an allergic release of histamine. The membrane of he mast cells are weak and release histamine with pressure causing an allergic-like reaction due to leakage in the small blood vessels.