Breast

"The breast is the upper ventral region of the torso of a primate, in left and right sides, which in a female contains the mammary gland that secretes milk used to feed infants. Both men and women develop breasts from the same embryological tissues. However, at puberty, female sex hormones, mainly estrogen, promote breast development, which does not occur in men, due to the higher amount of testosterone. As a result, women's breasts become far more prominent than those of men.
During pregnancy, the breast is responsive to a complex interplay of hormones that cause tissue development and enlargement in order to produce milk. Three such hormones are estrogen, progesterone and prolactin, which cause glandular tissue in the breast and the uterus to change during the menstrual cycle. Each breast contains 15–20 lobes. The subcutaneous adipose tissue covering the lobes gives the breast its size and shape. Each lobe is composed of many lobules, at the end of which are sacs where milk is produced in response to hormonal signals."

Nipple disorder

Anything that affects the nipple is considered a disorder, and disorders can range from mere nuisances to serious conditions. If you have scaly skin or a bloody discharge from the nipple, get help immediately. Breast nipple disorders include nipple swelling, breast lump, inflammation, nipple parasthesia, inversion and random nipple pain. Nipple pain can be caused by not wearing a well-fitting bra while jogging, rough sexual activity or a type of skin inflammation, such as candidasis, eczema, contact dermatitis or breastfeeding.