- Classified according to size
- Café au lait spots
- Speckled lentiginous naevus
- Naevus of Ota
- Mongolian spot
- Small congenitalnaevus
- Medium congenital naevus
- Giant naevus
- Hairy Congenital Naevi
- Definition
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- Pigmented naevi present at birth
- Nevus cells often involve lower dermis (amongst collagen) & even fat or muscle
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- Hamartoma
- Superficial part similar to compound nevus
- Deep part nests in sheaths of hair follicles, association with sebaceous glands & ducts
- New York Uni Registry Classification
- Based on projected size into adulthood
- Small ≤ 1.5cm in greatest diameter
- Medium: 1.5-19.9cm
- Small & medium – small risk of melanoma – mostly in adult life
- Large / Giant: ≥ 20cm
- Assoc with increased melanoma risk & also associated with neurocutaneous melanosis (e.g. CNS melanoma)
- Management
-
20cm – excise as infant/child
- < 10cm can observe
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