<unk>  or areolar pigmentation is pigmentation (darkening) of the<unk>  or areola. It is dose-dependently induced as an effect of estrogens and can occur normally during pregnancy and breastfeeding or as a side effect of high-dose estrogen therapy.
Nipple pigmentation
Blue nails
Green nails
Perryville Tree engravings
Black hairy tongue
Oral pigmentation
Elschnig spots
Owl's eye appearance