Disease directory
Nummular eczema
Published: September 18, 2026Updated: September 18, 2026
Important: Informational content intended for healthcare professionals. It does not replace clinical evaluation or establish a doctor-patient relationship.
Overview
- Alternative names: eczema/discoid eczema; nummular dermatitis.
- First description: classically attributed to Marie-Guillaume-Alphonse Devergie (19th century; clinical descriptions already outlined in the mid-1800s). [show_150ms_ease-in] » data-testid=»webpage-citation-pill»> Liebert Publishing
- Epidemiology (key): bimodal pattern (women 15–25 years; men 50–65), worsens in cold/dry climates; reported prevalence 0.1–9% depending on the series; recent German population cohort (2010–2021) confirms increased coding and association with xerosis and atopic dermatitis ( AD ) in adults. [show_150ms_ease-in] » data-testid=»webpage-citation-pill»> CNIB +1
- Codes: ICD-10: L30.0 (numular dermatitis) | ICD-11: EA82 (nummular dermatitis)
- Diagnostic checklist (quick):
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Typical clinical presentation: pruritic “coin-shaped” plaques on dry skin (legs/arms ± trunk).
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Rule out ringworm: active edge KOH (and/or PAS if biopsied).
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Consider DCA (Allergic Contact Dermatitis): patch test if recalcitrant/occupational/metals.
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4 mm punch biopsy if atypical, unusual recurrent or before systemic; request H&E ± PAS .
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