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Dermatographism - arm

Dermatographism - arm

Overview

Wheal formation at the site of light scratching of the skin.

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.