Fat Dissolving Injections
Fat dissolving injections use deoxycholic acid or similar formulations to destroy targeted fat cells in localized areas. Treatment requires careful patient selection, realistic expectations, and a consultation to determine whether your anatomy is appropriate.
Off-label use notice: Deoxycholic acid (Kybella) is FDA-approved for reduction of submental fat. Use of deoxycholic acid or fat-dissolving formulations in other body areas is considered off-label. Off-label use means the treatment is applied for a purpose not specifically listed in the FDA-approved labeling. All treatment decisions are based on your anatomy, medical history, and clinical judgment.
What fat dissolving injections are
Deoxycholic acid (Kybella) is an FDA-approved synthetic form of a naturally occurring molecule that disrupts and destroys fat cell membranes when injected into subcutaneous fat. The destroyed cells are gradually cleared by the body's inflammatory response. The FDA approval for deoxycholic acid covers submental fat (under the chin). Use in other body areas is considered off-label.
Off-label use
Deoxycholic acid is FDA-approved specifically for reduction of submental fat. Use in other areas — including jowls, axillary fullness, bra line, and abdomen — is considered off-label. Off-label use means the treatment is used for a purpose not specifically listed in the FDA-approved labeling, which is common in clinical practice. All use is based on your anatomy, medical history, and clinical judgment, and will be clearly discussed before treatment.
What fat dissolving injections can address
The most common and best-studied use is submental fat — the fullness under the chin that is resistant to diet and exercise. Off-label use may address small, well-defined pockets of subcutaneous fat in appropriate candidates. Fat dissolving injections are not a weight loss treatment and are not appropriate for significant or generalized excess fat.
Who may be a candidate
Adults with small, discrete, pinchable pockets of subcutaneous fat who are at or near a stable weight and who understand that multiple sessions are usually required. Submental candidates should have adequate skin elasticity — skin that cannot contract after fat reduction may result in visible laxity. Candidacy is determined at consultation after physical examination.
Who should avoid or delay treatment
Fat dissolving injections are not appropriate for patients who are pregnant or breastfeeding, have infection or active skin condition at the planned treatment site, have had prior surgical procedures in the area, have significant skin laxity that would be worsened by fat reduction, have certain nerve conditions in the treatment area, or have swallowing difficulties (for submental treatment). Disclose all medications and medical history at consultation.
What to expect during a session
After consultation and consent, the treatment area is marked and a topical numbing agent or local anesthetic is applied. A grid of small injections is placed into the fat layer. Sessions typically take 20 to 30 minutes. Most patients require two to four sessions spaced at least four to six weeks apart. The number of sessions depends on the amount of fat present and the response to prior treatment.
Recovery and downtime
Swelling, bruising, numbness, and tenderness in the treatment area are expected after each session and may be significant, particularly after submental treatment. Swelling under the chin can be noticeable for two to four weeks. Numbness can persist for several weeks and typically resolves. Avoid vigorous exercise for 24 to 48 hours and keep the area clean. Plan sessions with the recovery window in mind if you have events or commitments.
Risks and side effects
Common: significant swelling, bruising, numbness, tingling, hardness, and tenderness in the treated area lasting days to weeks. Less common: temporary difficulty swallowing (with submental injections near the marginal mandibular nerve), irregular contour if fat is not evenly eliminated, skin changes. Rare: marginal mandibular nerve injury causing temporary facial muscle weakness, skin ulceration from improper placement, or scarring. Not all fat responds equally — some areas may require more sessions or may not achieve desired reduction.
Alternatives
Alternatives for submental fat include surgical liposuction or neck lift (more predictable for larger volumes of fat or when significant laxity is also present), CoolSculpting (cryolipolysis), and radiofrequency-based devices. We discuss which approach may be most appropriate for your anatomy and goals at consultation.
How long results last
Fat cells destroyed by deoxycholic acid do not regenerate. Treated cells are cleared by the body and do not return — however, remaining fat cells in the area can enlarge with significant weight gain, which can affect the outcome. This is not a weight loss treatment and does not prevent changes in fat distribution with future weight changes. Results vary and depend on the number of sessions, anatomy, and individual response.
When to contact us
Contact us if you develop increasing pain, significant asymmetry, signs of skin ulceration, or difficulty swallowing that persists beyond the expected recovery period. Seek emergency care immediately if you experience any signs of a severe allergic reaction, or if you develop significant difficulty breathing or swallowing acutely after treatment.
Clinical notice
Information on this page is educational and does not replace an in-person consultation. Treatments are recommended only after reviewing medical history, anatomy, goals, and clinical suitability. Results vary. Appropriate candidates are determined at the time of consultation.
Some treatments described on this page include off-label uses. Candidacy requires an in-person exam and medical history review by a licensed provider.
If you experience severe swelling, vision changes, difficulty breathing, signs of vascular compromise, or another urgent symptom after treatment, seek emergency care immediately.
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