What are the physical findings of dermographism in pediatric atopic dermatitis (AD)?

Updated: Jun 03, 2020
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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Answer

Dermographism is a normal reaction in 5% of the population. After a firm pointed instrument is stroked against the skin, the path of the instrument is observed as a red line followed by an erythematous flare that ultimately develops into a wheal. This response occurs within 3 minutes of the insult. White dermographism is a paradoxical reaction wherein the initial red line is replaced within 10 seconds by a white line and an absence of a wheal. This reaction can be observed in atopic dermatitis and allergic contact dermatitis.


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