An<unk>  (occasionally invaginated nipple) is a condition where the nipple, instead of pointing outward, is retracted into the breast. In some cases, the nipple will be temporarily protruded if stimulated. Both women and men can have<unk> s.
Inverted nipple
Supernumerary nipple
Cracked nipple
Accessory breast
Bifid penis
Webbed penis
Shawl scrotum
Epispadias