A Brazilian butt lift procedure (BBL) is a treatment which adds volume to the butt, making the buttocks appear rounder, fuller, and more youthful. The key to the surgery is that volume is added to the butt using the fat that was extracted from elsewhere on the body. During this surgery, fat is harvested from the patient’s own body using liposuction. The fat is then refined and used as a sculpting medium by injecting the fat into the buttock area to achieve the desired changes in size, shape, contour, or profile.