Hi and welcome to our forum!Hematoma occurring after breast augmentation occurs with a frequency of 3%. In the vast majority of cases, it is unavoidable. Visible bleeding during surgery requires immediate attention. Control with ligature or cautery is accomplished. Packing the 4 breast quadrants with gauze is performed after the pockets are created. The gauze pads are then removed sequentially, controlling ALL bleeding prior to closure. The pocket is then irrigated with saline to ensure a clear blood free return. This a routine practice.But sutures may untie, crusts may separate from a cauterized blood vessel, or postoperative injury may be responsible for a postoperative hematoma.Bleeding can be rapid, with sudden breast enlargement , increasing firmness, bruising and pain, readily apparent. Or, it may be insidious with the bleed causing gradual symptom development. Regardless of how or when the bleed began, the treatment is the same (if the hematoma is of significant size). Open, irrigate, and drain...Best wishes...