Done by a highly experienced surgeon who's trained and board-certified, a Brazilian butt lift surgery should be safe. The injection deep into the muscles can damage the blood vessels, which is why fat should be injected into the subcutaneous tissue (above the muscles) of the patient’s bum, which is what the surgeons we work with do. In addition, there is no rejection of the fat tissue by the body since the surgical procedure uses the patient’s fat. You have to be careful around the buttocks area after the BBL and follow the aftercare instructions of the surgeon.