The head of the breast grew a small meat grain may be flat warts, sebaceous cysts, papillary tissue hyperplasia and so on. 1. flat warts: the disease is mainly caused by the human papilloma virus infection of the skin mucous membrane caused by benign superfluous organisms, resulting in skin damage, resulting in the patient’s nipple grew a small meatballs, usually no conscious symptoms, and occasionally light itch. 2. Sebaceous cysts: mainly secrete fat to lubricate the nipple and prevent it from drying out. If the nipple is not cleaned for a long time, the secretion will be blocked in the hair follicle, which will form cysts, resulting in the patient’s nipple growing a small grain of meat phenomenon. 3. Nipple tissue hyperplasia: Due to the overgrowth of breast glands and nipple skin cells, the surface of the nipple will have a granular protrusion. At the same time, intraductal papillomas and lipomas, inflammation of the nipple follicles, inflammation of the mammary glands, eczema-like breast cancer may appear nipple granules. Careful identification is needed. It is recommended to go to a regular hospital, under the diagnosis of the doctor, according to the patient’s condition, targeted treatment.