BLUE NEVUS
The blue nevus (BN) is a common, melanocytic proliferation in the dermis. The deeper location is the reason for the typical blue color (Tyndall effect).
- A small uniformly blue or green papule is typical.
- The blue-green color is due to the Tyndall effect, from the pigment being deeper in the skin.
- The blue nevus is diagnosed clinically and is entirely benign.
Clinical
A blue papule 2-6 mm in diameter on the scalp, face, dorsa of the hands or feet, or on the buttocks is characteristic. It may be present from birth or acquired later in life.
Treatment
Blue nevi are benign. However, very rarely, melanoma may develop. Thus, the patient should be instructed to seek immediate medical attention if there is any sudden change or growth--as they would do for any other mole.
Surgical removal may be done for cosmetic reasons.
Additional Photos
A blue nevus in the scalp.
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