Kybella is a man-made form of a substance, deoxycholic acid, that your body makes that helps absorb fat. It works by destroying fat cells where it is injected into the body. Kybella is used to help decrease the appearance of fat, most commonly used under the chin. It is also safe to use in areas, such as batwings (fat that hangs from bi-ceps) back fat, bra bulge, inner knee fat, lower buttocks fatty fold. The general rule of thumb is “if you can pinch it, you can treat it”.