Which tests are performed in the workup of Riehl melanosis (pigmented contact dermatitis)?

Updated: May 27, 2021
  • Author: Elizabeth K Satter, MD, MPH; Chief Editor: William D James, MD  more...
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Perform closed patch testing with the standard series, cosmetic series, fragrance series, and patient's personal products.

Photo-patch testing may also be warranted.

Provocative use test or repeated open application test (ROAT) is performed when closed patch testing results are equivocal or negative. The concentration of the allergen (eg, preservatives, fragrances) may be too low in the cosmetic series to produce a positive reaction on the back. [7]

Skin biopsy typically is not required unless there is an unusual clinical presentation.

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