Blue nevus
| Blue nevus | |
|---|---|
| Other names | Blue neuronevus, dermal melanocytoma, nevus coeruleus, nevus bleu |
| Blue nevus | |
| Specialty | Dermatology |
| Symptoms | Single well-defined blue-black bump |
| Complications | Rarely malignant transformation |
| Types | Dendritic, cellular |
| Causes | Unclear |
| Diagnostic method | Visualisation, dermoscopy |
| Differential diagnosis | Dermatofibroma, melanoma |
| Treatment | Monitoring, excision |
| Prognosis | Good |
| Frequency | Female>male |
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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.