this is one of the physical urticarias. Seen in about 5% of the population, it is usually asymptomatic. It may however become symptomatic with features of discomfort or itching
the reaction represents an exaggeration of the wheal response following scratching of the skin e.g. when towelling dry after a bath. The doctor can reproduce this condition by drawing a line on the skin of the back which results in linear wheals at the site of the 'line drawing'
the patient who has dermographism may also have ordinary urticaria as well
White dermographism:
seen in individuals with atopic dermatitis - in white dermographism firm stroking of the skin with a pointed instrument does not lead to the usual response characterized by a red line, flare, and wheal reaction - instead the initial red line is replaced, generally within a period of 10 seconds, by a white line without an associated wheal
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