Solitary blue‐black nodule on the back of a teenage boy

Abstract

A 14-year-old boy was evaluated for a new, dark nodule on the back that was first noticed months prior. He denied tenderness and pruritus, though noted it was getting darker in color and firmer over time. He lacked multiple nevi, lentigines, and a history of atrial myxomas. Medical history and family history were otherwise unremarkable. Physical examination of the right mid-back was notable for a 0.7 × 0.5 cm oval blue-black, firm nodule with central superficial erosion (Figure 1). No lymphadenopathy was appreciated. An excisional biopsy was performed for histopathological analysis (Figures 2, 3, and 4).