I have had breast surgery to remove a fibroadenoma lump from my right breast. Within days after the breast surgery, a new lump appeared suddenly in my right breast. I did a biopsy on the new lump and it is benign. For many years, the new lump has been stable in size and not growing. However, this year, the new lump started growing bigger and laterally in size. May I know what this new lump is? Is the new lump a fibroadenoma, fat necrosis, or scar tissue? The description of the new lump given in ultrasound is a mildly hypoechoic, gently lobulated solid nodule. Why did the lump appear suddenly within days after my breast surgery? If I decided to keep the lump in my breast and not do any surgery to remove it, would it lead to breast cancer? Please refer to the attached file for my ultrasound report.