Scaly plaques after 
onychomycosis therapy


A Caucasian male, aged 67 years, presented to the dermatology clinic. Some years earlier, he had used terbinafine for onychomycosis for 3 months; several months later, erythematous annular scaly plaques developed on the sun-exposed scalp, chest, back, and extensor arms.

A review of systems was negative for arthritis, seizures, and psychosis. Serologies were notable for positive Ro and La antibodies. ...