- The blue nevus is 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.
- A blue naevus (nevus) is a rather unusual but non-cancerous mole.
- The blue nevus is also called the blue skin mole, or Jadassohn-Tièche nevus with 2 clinically recognized variants : the common blue nevus and the cellular blue nevus.
- Clinically The blue nevus appears as a dark-blue or blue-black smooth nevus formed by melanin-heavily pigmented spindle cells in the middle and lower two-thirds of the dermis. Also, the blue nevus appears as a slate blue or bluish black, sharply circumscribed, flat or slightly elevated nodule, occurring on any area of the body.
- A biopsy should be performed on any changing pigmented lesion. For a solitary lesion, simple excision is usually curative. Rare cases of persistent blue nevi, manifesting as satellite lesions around the original excision site, have been reported. These must be distinguished from malignant blue nevus, and reexcision is recommended.
Common blue nevus
