Breast trauma
Breast trauma: Physical damage to a breast.
If a breast is injured by trauma, tiny blood vessels may rupture to cause localized bleeding (a hematoma).
The hematoma can be felt as a lump.
Trauma to the breast can also damage the fat cells in the breast tissue, a condition called fat necrosis.
Fat necrosis can form a lump in the breast.
This type of lump is not cancer