In general, breast cancer is more common around 2-3cm. Some patients have smaller diameter of breast cancer because they are found more timely and go to hospital for examination when there is a lump in the breast in time. Some patients have very large diameter breast tumors because they were not detected in time or did not go to the hospital for examination in time. Some patients have broken, bleeding or necrosis on the surface of the breast tumor and did not go to the hospital for examination, which is a less common phenomenon. For most patients, breast lumps, when found, go to the hospital for examination, usually 2-3cm lumps are more common. Generally, breast ultrasonography or mammography should be done to be able to judge the benignity or malignancy of breast lumps to consider doing surgery.