Group of melanocytic lesions which all appear blue in colour due to the optical effects of light reflecting off melanin deep in the dermis. The blue nevus, a benign, usually solitary lesion, represents a localized proliferation of dermal melanocytes. It presents as a dark blue to black, moderately firm, rounded, sharply defined nodular tumour composed of spindle-shaped melanocytes with slender cytoplasmic processes, occurring often in association with melanin-laden macrophages in a sclerotic dermis.
Blue Nevus, Nevus Ceruleus, Nevus Bleu
Blue naevus, Blue Nevu, Blue nevus, Blue nevus, NOS, Dermal melanocytoma, Jadassohn's blue naevus, Jadassohn's blue nevus, Nevu, Blue, Nevus, Blue