Mole or melanoma	Clinical features
Mole or melanoma	Age at onset	Location	Number	Size	Color distribution	Shape	Border
Normal moles	After six to 12 months of age, usually by 20 years of age	Any site, relative spanning of sun-protected sites	Few to 100s	Most < 6 mm in diameter	Orderly, symmetric distribution Usually no more than two shades of brown	Round, oval	Smooth, regular, well-demarcated
Atypical moles	After six to 12 months of age, usually by 20 years of age	Any site, even sun-protected areas Chest Back most heavily involved	One to 100s	No lower size limit	Disorderly More than two shades of brown Dark pigmentation	Round, oval, asymmetric	Irregular and/or poorly demarcated, fuzzy
Atypical moles	After six to 12 months of age, usually by 20 years of age		One to 100s	Usually > 6 mm in diameter	Disorderly More than two shades of brown Dark pigmentation	Round, oval, asymmetric	Irregular and/or poorly demarcated, fuzzy
Melanoma	Adulthood	Men: most often trunk Women: most often lower extremities, but can be any location where pigment cells are found	One	No lower size limit to > 6 mm in diameter	Change in color More than two shades of brown Very dark pigmentation	Asymmetric	Irregular
Melanoma	It can occur in children with giant congenital moles, atypical mole syndrome, or xeroderma pigmentosum		One	No lower size limit to > 6 mm in diameter		Asymmetric	Irregular