A Case of Plaque-type Blue Nevus / 대한피부과학회지

ABSTRACT

Blue nevi are usually solitary, but they may be multiple and form a plaque composed of multiple papules or nodules with an intervening flat area of blue coloration. It looks like a benign and asymptomatic lesion. However, because of its rarity, no definitive prognosis can be given. An 18-year-old male presented with a 5 x 4 cm-sized, speckled blue-black tumor on his posterior neck, which had existed since birth. Histopathologic examination showed clumps of melanocytes intermingled with irregularly arranged collagen bundles in the mid and lower dermis, with some extending to the subcutaneous tissue. We diagnosed the lesion as a plaque-type blue nevus, based on histopathologic findings of common blue nevus.