What is the role of patch testing in the workup of nummular dermatitis?

Updated: Nov 21, 2019
  • Author: Jami L Miller, MD; Chief Editor: William D James, MD  more...
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Some studies have recommended patch testing in patients with refractory nummular dermatitis. One study found that 50% of 56 patients with nummular eczema showed positive reactions on patch testing, and other research identified positive patch testing in 23 of 50 patients with nummular dermatitis. [29, 30]  A 2012 study strongly recommended patch testing in nummular dermatitis, as it showed that 332 (32.5%) of 1022 patients with nummular dermatitis had positive patch test results for one or more allergens. [5]

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