An extra flesh on the side of the nipple may be caused by flat warts, mastitis, adenoma adenoma or, trauma breast cancer. 1. Flat warts: Infection with human papilloma virus may cause flat warts. The patient’s nipples can appear on the edge of the wart-like oil caused by the above symptoms. 2. Mastitis: Inflammatory hyperplasia may be induced by bacterial infections around the nipple, which may cause the symptom of more than one flesh on the nipple, and may be accompanied by pain, redness and swelling. 3. Adenoma adenoma: after suffering from adenoma adenoma, with the increasing size of the tumor, it will cause pressure on the surrounding tissues, and the symptom of one more flesh on the side of the nipple can also appear. 4. Trauma: when the area around the nipple is stimulated by trauma, it can cause redness and swelling as well as skin ulceration and other symptoms, resulting in an extra flesh on the edge of the nipple. 5. Breast cancer: When breast cancer occurs in the breast, tumors may appear on the side of the nipple, resulting in the appearance of an extra flesh on the side of the nipple. Breast cancer can also be caused by an extra flesh on the side of the nipple, patients should go to the hospital in time to take appropriate treatment.