![]() ![]() ![]() This article interested me because it broadened my awareness about this type of rash. With round rashes, my differential was limited to tinea, if it had been there for a while, or urticaria and erythema multiforme, if it had just started. Like you, I’ve had little training in dermatology most of what I know was learned on the job and through continuing education. In erythema multiforme, the characteristic target lesions remain fixed for multiple days, as opposed to the transient lesions of urticaria.Nummular eczema is common during the winter months, with crusting, hyperpigmented, coin-shaped plaques on the lower legs, dorsal hands, and extensor surface of the arms.Psoriasis is suggested when lesions occur on the extensor surfaces of the limbs, umbilical region, and sacrum.As a general rule, the individual lesions last less than 24 hours. Urticaria produces wheals and well-defined, erythematous superficial swelling of the dermis. ![]() Pityriasis rosea produces diffuse eruption on the trunk and proximal extremities with oval-shaped, scaly plaques.Localized granuloma annulare produces annular lesions with smooth, non-scaly contours.Tinea corporis produces well-demarcated, erythematous, dry, and scaly lesions with raised red borders and central clearing.Annular skin lesions are round with central clearing, whereas nummular lesions are round with discrete margins without central clearing.
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