Dermatographism ("skin writing")

These lesions occurred three minutes after stroking with the wooden tip of a cotton swab.

Reproduced with permission from: Goodheart HP. Goodheart's Photoguide of Common Skin Disorders, 2nd Edition. Philadelphia: Lippincott Williams & Wilkins, 2003. Copyright © 2003 Lippincott Williams & Wilkins.

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