Breast lipomas are benign tumors, but there is some possibility of malignancy, so the danger or lack thereof is related to the lipoma itself. For non-malignant breast lipoma, there is no danger, while malignant lipoma is dangerous. 1. Lipoma without malignant transformation: breast lipoma itself belongs to benign tumor, which is composed of fat particles and grows slowly, mostly in lobular or flat shape, without pain and discomfort. When it is large in size or painful, it can be removed by surgery without any danger. 2. Malignant lipoma: If the breast lipoma grows fast, hard, not clearly demarcated from the surrounding tissues, with poor mobility, and invades the nerves and causes severe pain, it is considered to have the possibility of malignant transformation. It is necessary to give biopsy or postoperative pathological examination, and those with malignant changes will be given surgical resection and radiotherapy and chemotherapy as soon as possible. To sum up, although breast lipoma belongs to benign tumors, it is also dangerous. It is necessary to go to the hospital to complete the auxiliary examination to clarify the condition, and then the professional physician will give regular follow-up or corresponding treatment for the condition.