Small lumps around the breast are generally considered to be related to the Montgomery’s nodule, which is a normal physiological phenomenon, but may also be caused by sebaceous cysts, breast hyperplasia and other diseases. 1. Montgomery’s nodule: is the Montgomery’s gland duct opening bulge into, often manifested as areola darkening, sebaceous gland hypertrophy around the areola, feel like a circle of breasts have small lumps like. 2. Sebaceous cysts: usually associated with sebaceous gland duct obstruction, often appear around the breast growth of different sizes of spherical swelling, can be manifested as a circle of the breast with small bumps. 3. Mammary hyperplasia: usually associated with elevated levels of estrogen, leading to overgrowth of breast tissue, often manifested in the presence of a certain diffuse nodularity around the breast, which may be manifested as small lumps in a circle of the breast and may also be accompanied by a certain degree of tenderness. Small hard lumps around the breast may also be mastitis, breast cancer and other causes, such as the discovery of the above symptoms are recommended to go to the regular hospital in time for examination, under the guidance of the doctor to carry out the appropriate treatment.