Blue nevus
human disease
A blue nevus is a type of coloured mole, typically a single well-defined blue-black bump.
The blue colour is caused by the pigment being deep in the skin.
Diagnosis is by visualisation and dermoscopy. A biopsy is sometimes performed, or the whole lesion surgically removed. The outcome is generally good but there is a small chance of cancerous transformation. Differential diagnosis includes dermatofibroma and melanoma.
Blue nevi are more common in females than males. It was first studied in 1906 by Tièche, a student of Josef Jadassohn.
Classification
Blue nevi may be divided into the following types:
A patch blue nevus (also known as an "acquired dermal melanocytosis", and "dermal melanocyte hamartoma") is a cutaneous condition characterized by a diffusely gray-blue area that may have superimposed darker macules.
A blue nevus of Jadassohn–Tièche (also known as a "common blue nevus", and "nevus ceruleus") is a cutaneous condition characterized by a steel-blue papule or nodule.
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