| Blue nevus | |
|---|---|
| Other names | Blue neuronevus, dermal melanocytoma, nevus coeruleus, nevus bleu[1] |
 | |
| Blue nevus | |
| Specialty | Dermatology |
| Symptoms | Single well-defined blue-blackbump[2] |
| Complications | Rarely malignant transformation[3] |
| Types | Dendritic, cellular[2] |
| Causes | Unclear[3] |
| Diagnostic method | Visualisation, dermoscopy[4] |
| Differential diagnosis | Dermatofibroma,melanoma[3][5] |
| Treatment | Monitoring, excision[3] |
| Prognosis | Good[3] |
| Frequency | Female>male[2] |
Ablue nevus is a type ofcoloured mole, typically a single well-defined blue-blackbump.[1][2]
The blue colour is caused by the pigment being deep in the skin.[4]
Diagnosis is by visualisation anddermoscopy.[4] A biopsy is sometimes performed, or the whole lesion surgically removed.[3] The outcome is generally good but there is a small chance of cancerous transformation.[3] Differential diagnosis includesdermatofibroma andmelanoma.[3]
Blue nevi are more common in females than males.[2] It was first studied in 1906 by Tièche, a student ofJosef Jadassohn.[6]
Blue nevi may be divided into the following types:[7]: 701
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