Kybella

Kybella addresses submental fullness—the pocket of fat beneath the chin that can persist even when weight and habits are stable. Unlike liposuction it involves no incisions, and unlike device-based fat freezing it works through a series of small injections. Treatment is delivered over multiple sessions, and the change it produces is a cleaner transition between the chin and the neck rather than a dramatic reshaping of the lower face.

The injections act only on subcutaneous fat at the treated spots. They cannot tighten loose skin, and they do not help when fullness under the chin comes mostly from skin laxity, muscle banding, salivary glands, or bone structure—distinctions a clinician should assess before treatment. Some practices also use the drug off-label in small body areas, but that use falls outside the approved indication and deserves an explicitly cautious discussion. It is not a weight-loss treatment.

The active ingredient is synthetic deoxycholic acid, a molecule the body naturally produces to help break down dietary fat. Injected into the fat layer beneath the chin, it disrupts the membranes of fat cells; the destroyed cells are then cleared gradually by the body's own processes over the following weeks. Because those cells are removed rather than shrunken, they can no longer store fat—though the remaining cells still can, which is why a stable weight matters.