Fat-dissolving injections: ingredients, effects and adverse effects — deoxycholic acid versus mixed injections

Deoxycholic acid disrupts cell membranes, causing fat-cell lysis and inflammation, after which the tissue processes the resulting material. However, “contouring injections” may contain steroids, vasoactive agents, enzymes or unclear mixtures and are not the same procedure. Ingredients, concentration, total amount, injection depth and anatomy determine effects and risks of necrosis or nerve injury.

Randomized trials have demonstrated improved appearance with deoxycholic acid for submental fat in selected adults. It is not weight-loss or obesity treatment and does not address visceral fat, large fat volumes or skin sagging. Findings for the chin cannot simply be applied to the abdomen, arms, thighs or bra line; ingredient-specific effects and long-term safety of mixed injections may be more uncertain.

Adults with relatively stable weight and localized areas actually caused by subcutaneous fat may seek consultation. Always report pregnancy, breastfeeding, infection, skin disease, bleeding disorders, liver or kidney disease, swallowing difficulties, nerve or muscle disorders, hernia, reduced sensation, prior liposuction, surgery, fillers and unexplained lumps. Under the chin, fat must be distinguished from salivary glands, lymph nodes and nerves.

With the patient standing, the physician distinguishes fat, skin sagging, muscle and swelling, and records the product name, all ingredients, concentration, lot, total amount, approved sites and injection grid. Submental deoxycholic acid may cause swelling, bruising, pain, firmness and numbness lasting days to weeks. Larger areas such as the abdomen involve different doses and complications, requiring separate comparisons of approvals, evidence and alternatives.

Besides swelling, bruising, pain, itching, nodules and numbness, submental injections may cause an asymmetric smile from marginal mandibular nerve injury, difficulty swallowing, skin ulceration, necrosis or infection. Severe infection, scarring, deformity and tissue damage have been reported with unapproved or unclear products used in other areas. Spreading redness, pus, fever, skin color changes, blisters, or breathing or swallowing problems require immediate assessment.

Q. Do fat-dissolving injections reduce the number of fat cells?

A. Deoxycholic acid destroys fat-cell membranes at the injection site, but mixed injections differ by ingredient.

Q. Is it safe to inject the abdomen?

A. Approval data for the submental area cannot be applied directly to the abdomen. In 2026, the FDA warned of serious adverse reactions from use outside the submental area.

Q. Does greater swelling mean more fat has dissolved?

A. Swelling is an inflammatory response and does not indicate the magnitude of the effect.

The U.S. FDA’s 2026-9 deoxycholic-acid label warning (https://www.fda.gov/drugs/drug-safety-communications/fda-approves-additional-information-labeling-kybella-deoxycholic-acid-injection-warning-adverse), the latest approved label (https://www.accessdata.fda.gov/drugsatfda_docs/label/2026/206333s007lbl.pdf), and safety guidance on unapproved fat-dissolving injections (https://www.fda.gov/drugs/buying-using-medicine-safely/using-fat-dissolving-injections-are-not-fda-approved-can-be-harmful) were consulted. A randomized trial of submental fat is available on PubMed (https://pubmed.ncbi.nlm.nih.gov/24147933/). Korean approval takes precedence.

SEOLREIM Clinic does not explain fat-dissolving injections only in terms of “how many cc.” The doctor personally assesses fat, muscle, edema, skin laxity, and high-risk structures, then compares only 2–3 necessary options among injections with disclosed ingredients, concentrations, and total amounts and signature body programs such as ONDA, InMode Body, and radiofrequency. The doctor performs the treatment directly according to SEOLREIM’s principles of authentic products, correct quantities, and attentive care.

Visitors searching for “body contouring Korea” or “medical tourism Korea” should confirm the product name, full ingredient list, concentration, total amount, approved treatment area, long-haul flight plans, and a plan for responding to infection, necrosis, or neurologic symptoms after returning home. SEOLREIM Clinic is on the 11th floor of the Gangnam 8258 Building, about 1 minute from Exit 3 of Gangnam Station. Appointments can be made through the website’s KakaoTalk consultation, Naver booking, or telephone channels. International visitors comparing information on a Gangnam skin clinic, Seoul skin clinic, Gangnam Station skin clinic, or Korean skin clinic should prepare their passport, allergy information, medication list, recent treatment records, and departure schedule, and should confirm available consultation languages and the scope of interpretation support before booking. Depending on the examination findings, same-day treatment may not be possible, or follow-up after returning home may be necessary.

Written by: SEOLREIM Content Editor / Medical review: Completed / Review confirmation date: 2026-10-23 / Publication date: 2026-09-27 / Updated: 2026-10-27. This is general medical information and does not replace individual diagnosis or a treatment prescription.