Clinical features of common nevi, atypical nevi, and melanoma

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

Reproduced from: Marghoob AA, Kovalyshyn I, Halpern AC. Management of Dysplastic Nevi and Melanomas. In: Surgery of the Skin, 2nd ed, Robinson JK (Ed), Elsevier 2010. Table used with the permission of Elsevier Inc. All rights reserved.

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Clinical features of common nevi, atypical nevi, and melanoma