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Diagnosis

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nummular dermatitis AND tinea corporis

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American Academy Dermatology nummular dermatitis tinea corporis diagnosis clinical examination

The lesion appears most consistent with nummular eczema (discoid dermatitis): a small, round, scaly, inflamed patch. Dry surrounding skin and darker discoloration around the ankle can occur with irritation or venous/stasis-related skin changes.
However, a photo cannot confirm this. Tinea corporis (ringworm) is an important alternative because it can look similar and needs antifungal treatment rather than steroid cream alone. A clinician or dermatologist can check the edge scale with a simple KOH fungal test. Nummular dermatitis must be distinguished from fungal infection, psoriasis, contact dermatitis, and stasis dermatitis. Dermatology 2-Volume Set, 5e, Differential Diagnosis. The AAD overview likewise notes that ringworm can mimic nummular eczema.
Until examined:
  • Use a bland moisturizer twice daily and avoid scratching, fragranced soaps, and irritants.
  • Do not use a strong steroid or steroid-antifungal combination without confirming it is not fungal.
  • Arrange a dermatology or primary-care assessment, especially if it is spreading, very itchy, recurrent, or not healing.
Seek prompt care if there is increasing pain, warmth, swelling, pus, fever, or a rapidly enlarging ulcer.
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