What it is
Kybella is deoxycholic acid — a synthetic version of a bile acid your body produces naturally to break down dietary fat. Injected into a fat pad, it disrupts the membrane of fat cells, which are then cleared by the body over the following weeks. The destroyed fat cells do not regenerate.
Kybella is not a filler. It does not add volume. It does the opposite — it permanently reduces a localized fat pad. It is not a neurotoxin. It does not relax muscle. The old website conflated this product with HA filler; that information was wrong, and the correction matters because the candidacy, mechanism, downtime, and expected result are different from any other injectable.
FDA-approved for the treatment of submental fat — the fat pad under the chin that produces the “double chin” appearance, particularly visible in profile.
How Dr. Brown approaches it
Kybella at Esvie starts with a careful assessment of what is causing the submental fullness. Submental fat responds to Kybella. Submental skin laxity does not — Kybella will reduce the underlying fat but cannot tighten the overlying skin, and in patients whose skin tone is the primary issue the result can be a smaller but looser-looking neck. That is why candidacy comes first.
Dr. Brown evaluates the size and depth of the fat pad, skin elasticity, the position of the marginal mandibular nerve, and whether adjacent treatments (skin tightening, jawline filler) belong in the same plan.
Each session uses a grid of small subcutaneous injections — typically 20 to 50 injections per session — into the fat pad itself, carefully placed to avoid the marginal mandibular nerve laterally. Most patients require two to four sessions spaced four to six weeks apart for full effect.
Every injection is placed by Dr. Brown. The marginal mandibular nerve runs in close proximity to the treatment area, and injection in the wrong plane can produce a temporary asymmetric smile. Only a physician injector should be in this anatomy.
What to expect
Day of treatment: Topical numbing followed by infiltrated lidocaine to the treatment area. The injection grid takes 15–20 minutes; the full visit runs 30–45 minutes.
First 3–7 days: Significant swelling under the chin. This is expected and is the inflammatory response that delivers the result — the fat pad is being broken down. Patients often describe the swelling as a “frog-throat” or “fullness.” It resolves but is not subtle. Plan for visible swelling and avoid scheduling sessions immediately before photographed events.
Weeks 1–4: Swelling continues to resolve. Tenderness, numbness, and mild bruising are common.
Weeks 4–6: Reduction begins to be visible. The full result of a single session matures over four to six weeks, which is why the next session is scheduled at that interval.
Final result: Visible after the full session series — typically two to four sessions. The reduction is permanent; the fat cells destroyed do not return.
Aftercare: Cold compress for swelling on day-of. Avoid manipulating the treated area. No strenuous exercise for twenty-four hours.
Candidacy
Good candidates have moderate, well-defined submental fat with reasonable overlying skin tone. Patients in their thirties through fifties with a true fat pad — not just descended skin or a recessed chin — are typical Kybella candidates.
Not a candidate if the fullness is primarily skin laxity. Not a candidate if you have difficulty swallowing or a history of dysphagia. Not a candidate if you are pregnant or nursing, or have active infection in the area.
If Kybella is not the right tool for your concern, Dr. Brown will say so. Submental fullness driven by a recessed chin often responds better to chin filler (Voluma) for projection. Skin-driven submental laxity may respond to skin tightening rather than fat reduction. Often the right answer is a combination plan — Kybella for the fat, filler for the chin angle, evaluated together.