Observation
An otherwise healthy, 30-year-old man, presented with a non-pruritic hyperpigmented skin lesions of the trunk. At the time of presentation, the eruption has been present for 3 years and different antifungal treatments were ineffective. Upon physical examination, we noted brown to hyperpigmented hyperkeratotic macules and papules on the center of the upper trunk that coalesce into reticulated plaques in the periphery of the chest and in the axillar region (figure 1). Wood’s lamp examination was negative for yellowish green fluorescence and fungal staining was negative for fungus. Histological examination showed orthohyperkeratosis, papillomatosis and focal acanthosis. The patient was treated with doxycycline 100 mg twice daily with a complete remission after four weeks (Figure 2). No recurrence was noted within two months of follow-up.