Need expert help here. what are butt injections and how do they work.?

Products or fat?: There are four conventional methods of buttock augmentation:1) use your own tissue flaps usually performed at the same time as a body's lift following massive weight loss, 2) implants which tend to have a high complication rate, 3) injections with fillers such as macrolane or silicone which may either resorb or extrude or form foreign body reactions or 4) fat injections requiring donor sites and..