Symptoms are thought to be the result of histamine being released by mast cells on the surface of the skin. Despite the lack of antigens, histamine causes the skin to swell in affected areas. If the membrane that surrounds the mast cells is too weak it will easily and rapidly break down under physical pressure, which then causes an allergic-like reaction. Symptoms can be caused or induced by: * stress * tight or abrasive clothing * watches * glasses * heat * cold * pressure on exposed skin * infection * diet * air currents : air flow moving hairs on skin surface The underlying cause of dermographism is not known, and it can last for many years without relief. The condition may subside and be effectively cured; however, it is often a lifelong ailment. It is not a life-threatening disease, and it is not contagious. Dermographism may occur in mastocytosis (systemic mast cell proliferation).
Dermatographic urticaria
Delayed pressure urticaria
Solar urticaria
Physical urticaria
Aquagenic urticaria
Cold urticaria
Pressure urticaria
Heat urticaria