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Dermatographism on the back

Dermatographism on the back

Overview

In dermatographism, hives are readily produced if the skin is lightly scratched.

Update Date 3/14/2016

Updated by: Stuart I. Henochowicz, MD, FACP, Associate Clinical Professor of Medicine, Division of Allergy, Immunology, and Rheumatology, Georgetown University Medical School, Washington, DC. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.