Breast fibroma is a common benign disease, manifested as painless and movable breast lumps, which is usually not cancerous after diagnosis, and the risk of cancer is extremely low. The signs of cancer are usually as follows: enlargement and hardening of the lump, local skin changes and nipple abnormality. 1. Enlargement and hardening of lumps: breast fibroma lumps are usually smooth, tough, and with good mobility, and the size of the lumps will not change significantly over the years. However, if the lumps are found to be enlarged rapidly within a short period of time, and the texture of the lumps become hard and their mobility become worse, it may be a sign of cancer. 2. Local skin changes: breast fibroma will not cause local skin changes of breast, but if you find that the local skin of the lump is red, wrinkled and has uneven “orange peel-like” appearance, it may be a sign of cancer. 3. Nipple abnormality: breast fibroma usually does not cause nipple abnormality, but if you find abnormal nipple overflow or nipple inversion, you should be alert to the possibility of cancer. If you find abnormal nipple overflow or nipple inversion, you should be alert to the possibility of breast fibroid cancer. Breast fibroid cancer may also have symptoms such as swollen lymph nodes in the armpit, but the risk is low.