Small bumps around the nipple may be caused by normal breast tissue, or sebaceous cysts or allergies. 1. Normal breast tissue: around the breast is the areola tissue, and there are sebaceous glands in the areola tissue, which normally secrete oil and can protect the nipple mammary tissue. Especially when a woman enters into pregnancy, due to the body’s estrogen and progesterone level secretion, the small bumps around the nipple will have obvious bumps, clinically known as Montgomery’s nodule. 2. Sebaceous cysts: Sebaceous cysts can also be caused by daily inattention to hygiene around the nipple, leading to contamination of the sebaceous glands around the nipple, resulting in small bumps around the nipple. 3. Allergy: It is also possible that the skin around the nipple is more sensitive and allergic to the material of underwear causing small bumps. If the allergy symptoms are not particularly serious, the localization may simply be small bumps, and will not appear other abnormalities. If they are more severe, they may be accompanied by itching as well as pain. Small bumps around the nipple may also be tumors and other factors, the occurrence of the above situations need to go to the hospital for examination, to clarify the cause and follow the doctor’s instructions for treatment.