<unk> s are round bumps found in the<unk>  and sometimes on the nipple. Variation The tubercles become more pronounced during pregnancy. The number of glands can vary greatly, usually averaging from 4 to 28 per breast.
Areolar gland
Skene's gland
Serous gland
Meibomian gland
Callus
Ciaccio's glands
Krause's glands
Adrenal gland