Dermatographism is characterized by the ability to “write” on the skin. Light touch or pressure elicits a raised, erythematous reaction that is often pruritic. The condition occurs most commonly in young adults. It is sometimes associated with urticaria, although this patient did not have hives elsewhere. The temporal relationship to amoxicillin therapy suggests potential causality; however, the majority of cases are idiopathic. Asymptomatic patients do not require therapy. Those with pruritus may benefit from an oral antihistamine. Most cases are self-limiting.

Dr. Schleicher is director of DermDOX Center in Hazleton, Pennsylvania, a clinical instructor of dermatology at the Philadelphia College of Osteopathic Medicine and Kings College in Wilkes-Barre, Pennsylvania, and an associate professor of medicine at the Commonwealth Medical School in Scranton, Pennsylvania. He is also a member of the EMERGENCY MEDICINE editorial board.

Emerg Med 41(12):7-8, 2009