Feature Article

Discoid eczema – more than just dermatitis

Feature Article

Discoid eczema – more than just dermatitis

JOSHUA FARRELL, Stephen Shumack

Figures

© aleksej/stock.adobe.com model used for illustrative purposes only
© aleksej/stock.adobe.com model used for illustrative purposes only

Abstract

Discoid, or nummular, eczema is a chronic form of dermatitis characterised by well-defined circular plaques. Associations include allergic contact dermatitis, low environmental humidity and excessive alcohol intake. It is managed by avoidance of triggers and use of emollients and topical corticosteroids.

Key Points

  • Discoid eczema is a sub-type of nonatopic eczema defined by circular or oval plaques of eczema with a well-demarcated edge.
  • It tends to follow a chronic course.
  • The four clinical variants of discoid eczema are exudative nummular eczema, dry type nummular eczema, discoid eczema of the hands and exudative discoid with lichenoid chronic eczema.
  • Differential diagnoses for eczema include tinea corporis, psoriasis and pityriasis rosea and are important to rule out for optimal management.
  • It is managed through conservative skin care measures, as well as use of emollients and topical corticosteroids.
  • Secondary infection with Staphyloccocus species is common and requires treatment with systemic or topical antibiotics.