Dermographism can be treated by substances which prevent histamine from causing the reaction (i.e. an antihistamine). These may need to be given as a combination of H1 antagonists, or possibly with an H2-receptor antagonist such as cimetidine. An example of dermographism Over-the-counter vitamin C, 1000 mg daily, increases histamine degradation and removal. Refraining from taking hot baths or showers may help if the condition is generalized (i.e. all over), as well as possibly for localized cases (i.e. in a specific area). If taking hot showers helps, it may be a condition called shower eczema. If it affects mainly the head, it may be psoriasis. In rare cases, allergy tests may uncover substances the patient is allergic to. While cromoglycate, which prevents histamine from being released from mast cells, is used topically in rhinitis and asthma, it is not effective orally for treating chronic urticaria.
Dermatographic urticaria
Delayed pressure urticaria
Solar urticaria
Physical urticaria
Aquagenic urticaria
Cold urticaria
Pressure urticaria
Heat urticaria