Round lumps in the inner upper quadrant of the breast may be related to breast fibroma, breast cyst, sebaceous cyst and other causes. 1. Breast fibroma: most of them are solitary lumps, mostly round or oval in shape, with smooth surface, which can be moved easily without adhesion. 2. Breast cysts: Breast cysts can be single or multiple, can be round or oval in shape, with smooth surface and clear boundary on palpation. 3. Sebaceous cysts: If sebaceous secretions are blocked under the skin, sebaceous cysts can be formed, which may appear as round bumps. It is recommended that people with round bumps in the inner upper quadrant of the breast should go to the hospital in time to clarify the cause of the disease and carry out standardized treatment under the guidance of the doctor.