Blue Nevi appear as well-defined blue papules or nodules and are frequently confused for or as melanoma. However, they are completely benign. They may be congenital (blue nevus of Jadassohn-Tiche)…typical lesions are steel-blue papules that begin in early life. Some may be large, but most grow slowly and rarely are more than 2-10 mm in diameter. Most occur on the dorsal hands, feet, and face. Histologically the lesions are composed of melanocytes and melanophages that are deeply penetrating. It is this deep penetration that gives them their dark blue color.
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