The following treatments are needed if the hard lumps of canker sores don’t go away: hot compress, massage, anti-inflammation, surgery, and so on. 1. Hot compresses: after the occurrence of canker sores, hard lumps will appear on the breasts, which need hot compresses, such as external hot towels, etc., which can accelerate blood circulation and help the absorption of inflammation, and the hard lumps will increase and subside. 2. Massage: breast carbuncle and milk stagnation, you can properly massage the breast, can make the milk discharge, can make the inflammation gradually subside, help to relieve the hard lumps in the breast. 3. Anti-inflammatory: canker sores are related to bacterial infections, so they need anti-inflammatory treatment. It is recommended to take anti-inflammatory drugs intravenously, and after the inflammation is relieved, the hard lumps can be gradually relieved. 4. Surgery: In the case of canker sores, abscesses will be formed locally, which can be incised and drained or punctured and drained, which can make the hard lumps subside. It is recommended to go to the hospital in time, need to complete the ultrasound and other tests, can determine the severity of the disease, and then decide how to treat.