Small bumps appearing a few months after the incision after breast cancer excision may be caused by scar hyperplasia, lipoma, or recurrence. 1. Keloid hyperplasia: During the healing process of the wound after breast cancer excision, granulation tissue is formed, which leads to scar tissue hyperplasia and the symptom of small bumps. 2. Lipoma: during the recovery period of breast cancer excision, localized lipoma will also appear, which is mainly manifested as symptoms such as good mobility and soft touch. 3. Recurrence: recurrence is very likely to occur after breast cancer is removed. For breast cancer recurrence, it may be found that there is a hyperplastic lump or small lump near the surgical incision of breast cancer. It may grow faster, and the border does not feel particularly clear when you touch it with your hands, and it is not very smooth and has poor mobility. When small lumps appear on the incision a few months after surgery, breast cancer patients should seek timely medical treatment, clarify the cause of the disease under the guidance of the doctor, and actively take effective treatment.