title: Symptomatic dermographism.
abstract: Urticaria is caused by physical factors in almost 12 percent of cases. These factors include pressure. Dermographism is the appearance of whealing and erythema within minutes where skin has been exposed to pressure or mechanical irritation. Symptomatic dermographism is present when "normal" pressures, such as those encountered in the activities of daily living, cause urticaria. Individuals with symptomatic dermographism can be shown to have a lower pressure threshold for the production of dermographism than normal individuals. A case of symptomatic dermographism is presented, and the differential diagnosis is discussed.
mesh_terms: D000328:Adult; D002927:Cimetidine / Q000627:therapeutic use; D003877:Dermatitis, Contact / Q000175:diagnosis; D003937:Diagnosis, Differential; D006634:Histamine H1 Antagonists / Q000627:therapeutic use; D006801:Humans; D008297:Male; D011312:Pressure / Q000009:adverse effects; D014581:Urticaria / Q000175:diagnosis* / Q000188:drug therapy / Q000209:etiology
chemical_list: D006634:Histamine H1 Antagonists; D002927:Cimetidine