There is no perfect shape or size for breasts. Normal breasts can be large or small, smooth or lumpy, and light or dark. Your breasts start growing when you begin puberty. During puberty the hormone levels in your body change, which causes your breasts to develop and your periods to start. The inside of your breasts is made up of fatty tissue and milk-producing glands, called mammary glands. The dark area of your breast around your nipple is called the areola.
For endocrinology appointment information, please call For diabetes appointment information, please call the Barbara Davis Center at The onset of breast development in girls less than 8 years of age may be the first sign of precocious puberty or more likely a condition referred to as benign premature thelarche.
When Felicia Mahone was 27, she felt her breast and found a mass. Breast cancer had killed nearly all the women in her family—her mother, two aunts and two cousins. Her doctor, though, downplayed the lump, assuring her everything would be all right.