Small bumps next to the nipple are considered to be Montgomery’s nodule, breast hyperplasia, breast fibroma, breast cyst, breast cancer, etc. 1. Montgomery’s nodule: Montgomery’s nodule appears in the periphery of areola, which is formed by the bulge of Montgomery’s gland at the opening of the duct, and can be manifested as a small lump next to the nipple, which is a normal phenomenon. 2. Mammary hyperplasia: Mammary hyperplasia is related to the imbalance of estrogen-progestin ratio and elevated prolactin. The main symptoms of patients are breast pain, breast nodules or lumps, which may be manifested as small bumps next to the nipple. Some patients may also have nipple discharge. 3. Breast fibroma: the cause is still unclear, and it is considered to be related to the abnormal increase in the sensitivity of breast tissue to estrogen and overgrowth. Breast fibroid will cause some patients to have small lumps next to the nipple, and some patients may have pain symptoms. 4. Breast cysts: Breast cysts can cause small bumps next to the nipple in some patients, and the cause is not yet clear. Breast cysts may also be accompanied by breast pain, nipple discharge and other symptoms, and when complicated by infection, axillary lymph node enlargement may also occur. 5. Breast cancer: it is a malignant tumor, which can also cause small lumps next to the nipple. The cause of breast cancer is still unclear, it may be related to heredity, exposure to ionizing radiation, etc. Patients are also prone to breast skin abnormalities, nipple discharge, swollen lymph nodes in the armpit and other symptoms. Meanwhile, in addition to this, some peri-mammary skin diseases may also manifest as small bumps next to the nipple, which should be identified. It is recommended that those who have small bumps next to the nipple with other uncomfortable symptoms should consult a doctor in time for examination and treatment under the guidance of a doctor after a clear diagnosis.