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.