A few days after the operation, the patient will find a small lump on her breast. In this way, patients should never apply hot compress, which will cause the blood clot in the hematoma to melt and lead to the wound bleeding again. Can be properly cold compress or untreated, while avoiding strenuous activities. Most small hematomas will slowly absorb themselves in about 2~3 months, and it takes about half a year for larger hematomas to absorb and subside.