What is the role of contact dermatitis in the etiology of nummular dermatitis?

Updated: Nov 21, 2019
  • Author: Jami L Miller, MD; Chief Editor: William D James, MD  more...
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Answer

Contact dermatitis may play a role in some cases. Contact dermatitis may be irritant or allergic in nature. Sensitivity to nickel, cobalt, or chromates has been reported in patients with nummular dermatitis. In one study, the most frequent sensitizers were colophony, nitrofurazone, neomycin sulfate, and nickel sulfate. In the past, cases of nummular eczema–like eruptions have been caused by ethyl cyanoacrylate–containing glue, thimerosal, [15] mercury-containing dental amalgams, [16] and depilating creams containing potassium thioglycolate. [17]


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