Case 1: Granuloma annulare
The patient has granuloma annulare, A, a condition that has no known cause. The rash persists for months or years before spontaneously involuting, and it is refractory to most treatments. Subacute lupus erythematosus, tinea corporis, and psoriasis all present with scale and are usually pruritic. Erythema annulare centrifugum manifests with trailing scale.