The weals are usually on the surface but some deep extension may occur and giant weals develop. However, these swellings die away rapidly and usually clear after half to one hour. Dermographism may last for months or go on indefinitely. In many patients, however, it clears within a year or two, or at least the wealing is reduced to a degree which no longer causes significant symptoms. If you have dermographism, seek your dermatologist or doctor's advice.
Antihistamines often give good relief from symptoms.
The new non-sedating ones are generally preferred. You should also avoid hot baths or showers, rough towelling down and rough clothing against the skin.