How is patch testing used in the workup of lichen simplex chronicus?

Updated: Feb 15, 2019
  • Author: Jason Schoenfeld, MD; Chief Editor: William D James, MD  more...
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Patch testing helps exclude allergic contact dermatitis as an underlying primary dermatosis (eg, allergic contact dermatitis to nickel with secondary lichen simplex chronicus) or as a factor in chronicity (eg, allergic contact dermatitis to topical corticosteroids used to treat lichen simplex chronicus).

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