What causes nummular dermatitis?

Updated: Nov 21, 2019
  • Author: Jami L Miller, MD; Chief Editor: William D James, MD  more...
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The etiology of nummular dermatitis is unknown and likely multifactorial. Most patients with nummular eczema also have very dry (xerotic) skin. Local trauma, such as arthropod bites, contact with chemicals, or abrasions, may precede an outbreak.

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