Fat necrosis occurs when the body replaces damaged fatty tissue with scar tissue that forms as hard, lump-like areas in the breast. Another complication of traumatic breast injury is an oil cyst.

The symptoms of fat necrosis do not usually show up immediately after a trauma or surgery. They can take weeks or months to appear. According to the American Cancer Society, fat necrosis and oil ...

Fat necrosis or lumps Damaged breast tissue can ... Hematoma A hematoma is an area of blood buildup where the trauma occurred. This leaves a discolored area similar to a bruise on your skin.