A 35-year-old male complained of skin rash across his trunk for one month. The lesion was only mildly itchy, and he reported no systemic symptoms. He had applied proprietary topical antifungal treatment with no significant improvement. The rash had increased in size in recent days. He denied any preceding contact with allergens or any arthropod bites. He enjoyed good general health with no ongoing drug treatment. Examination showed a large red plaque on his trunk with peripheral erythema, and central hyperpigmentation was noted. There were no vesicles or scaling noted on the border of the lesion.