Feature | Common nevi | Atypical nevi | Melanoma |
Symmetry | Symmetric | Variable | Usually asymmetric |
Border | Regular; well defined | Irregular; ill defined | Irregular; sometimes sharp |
Color | Uniform and few colors (tan/brown) | Variegated; tan/brown/black/red | Variegated; tan/brown/black/red/ white/blue |
Diameter | ≤6 mm | >5 mm | Usually >5mm |
Change over time | Slow then stable; many will regress | Slow then stable; some will regress | Faster (over months) |
Surface | Uniformly macular or elevated | Macular or elevated with peripheral macular "shoulder" | Macular and/or elevated |
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