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A naevus is a benign proliferation of one or more of the normal constituent cells of the skin. Naevi may be present at birth or may develop later. The commonest naevi are those containing benign collections of melanocytic naevus cells, but other types of naevus are found ( Table 54.1 ). Vascular haemangiomas and malformations are dealt with on page 146.
Table 54.1
A classification of naevi
| Group | Example |
|---|---|
| Melanocytic | Congenital (p. 127) |
| Junctional | |
| Intradermal | |
| Compound | |
| Spitz | |
| Blue | |
| Halo | |
| Becker’s naevus | |
| Dysplastic (p. 120) | |
| Vascular | Infantile haemangioma (p. 146) |
| Congenital haemangioma (p. 146) | |
| Capillary malformation, e.g. port wine stain, salmon patch (p. 146) | |
| Arterio-venous malformation (p. 146) | |
| Epidermal | Warty naevus |
| Connective tissue | Tuberous sclerosis (p. 112) |
Melanocytic naevi
Melanocytic naevi (‘moles’) are common. They are present in most Caucasians but are less prevalent in people of East Asian or black African heritage.
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