Classic ringworm infection pattern. Round to oval plaque, sharp scaling border. Single lesion or many. Eczema, psoriasis, impetigo may be similar. Patients call anything round ‘ringworm.’

Initial plaque appeared eczematous; treated with topical steroids. Acute inflammation occurred when steroids were stopped. Potassium hydroxide examination of border scale proved the diagnosis.

Tinea can progress for years with few symptoms. Topical steroids had no effect. Follicular papules indicate extension of infection into follicle depths. Cleared by terbinafine 250 mg q.d. for 2 weeks.