Test your diagnostic skills in our regular dermatology quiz. What is the cause of this painless and nonpruritic skin eruption?
A 10-year-old boy presents with a painless, nonpruritic eruption affecting his neck (Figure). The skin is dry and hyperpigmented. The eruption appeared suddenly during a flare of eczema that is being treated with topical corticosteroid, emollient and a bath oil containing the antiseptic triclosan.