Describe the features of breast fat necrosis.?

Painless lump. Fat necrosis of the breast often occurs after injury to the breast tissue. It typically causes a painless lump within the breast. If you have a lump in your breast, you should consider seeing a doctor to determine the cause.
Breast fat necrosis. Fat necrosis in the breast may occur following surgery. If this is suspected, an imaging study may be performed such as ultrasound, a mammogram or an mri.