Double Chin Fat-Dissolving Injections: How Are They Different From Contouring Injections?

A double chin can remain noticeable even after weight loss, regular exercise, and careful dieting. For many patients, submental fat—the fat beneath the chin—is particularly difficult to reduce because fat cells in this area may be structurally concentrated and respond less readily to lifestyle changes.

For international patients considering injectable double chin contouring in Korea, it is important to understand that not all “fat injections” work in the same way. The treatment mechanism, expected results, downtime, and side-effect profile can vary significantly.

Contouring Injections vs. Fat-Dissolving Injections

Although these treatments are often grouped together, conventional contouring injections and true fat-dissolving injections have different purposes.

Conventional Contouring Injections

Traditional contouring injections are generally intended to help reduce the volume or contents of fat cells. However, the fat cells themselves may remain in place. If a patient gains weight afterward or does not maintain their lifestyle habits, the treated area may regain volume over time.

Fat-Dissolving Injections

True fat-dissolving injections are designed to act on the membrane of fat cells. After the targeted fat cells are broken down, the body gradually processes and eliminates the cellular debris through its natural metabolic pathways.

Because the treatment targets fat cells themselves, results may be long-lasting when accompanied by stable weight management. However, no injectable treatment can prevent future weight gain or changes in facial contour caused by aging.

What Is NUVIJU?

NUVIJU is a cholic acid (CA)-based fat-dissolving injectable developed in Korea by Medytox.

Cholic acid is a bile acid naturally produced by the body and involved in the digestion and emulsification of dietary fat. When used as an injectable treatment for localized submental fat, it is intended to break down fat cells in the treated area. The body then gradually clears the resulting material through normal metabolic processes.

For medical tourists, NUVIJU may be of interest as a non-surgical option for improving the appearance of a double chin and creating a more defined jawline.

How Does NUVIJU Compare With DCA-Based Treatments?

Deoxycholic acid (DCA) injectables, including products such as Kybella, have been widely recognized as fat-dissolving treatments for submental fullness. However, patients may experience temporary side effects after treatment, including:

• Burning or stinging sensations
• Tenderness and discomfort
• Noticeable swelling beneath the chin
• Bruising or numbness
• A recovery period before returning comfortably to social activities

NUVIJU was developed with a formulation intended to better align with the body’s pH and osmotic pressure. According to the manufacturer and clinical approach described by HEV Dermatology, this may help reduce tissue irritation and may offer a more comfortable recovery experience compared with some conventional DCA-based injectables.

Individual experiences vary. Swelling, tenderness, and bruising can still occur after any fat-dissolving injection, and your physician should explain the expected recovery process before treatment.

Who May Be a Good Candidate?

A consultation is essential, but NUVIJU may be considered for patients who:

1. Have persistent double chin fullness despite dieting and exercise
2. Have remaining fat volume after previous contouring injections
3. Prefer a non-surgical alternative to liposuction
4. Want a gradual improvement in jawline definition
5. Have concerns about the pain or swelling they experienced with previous injectable contouring treatments

Patients with very loose skin, significant skin laxity, or a large volume of submental fat may require a combination treatment plan rather than injections alone.

Combining Fat Reduction With Skin Tightening

Fat reduction and skin tightening are two separate concerns. If submental fat is reduced in a patient with limited skin elasticity, loose skin may become more apparent.

For this reason, a physician may recommend combining fat-dissolving injections with energy-based skin-tightening treatments. A personalized combination plan can help address both localized fat and skin laxity for a more balanced jawline contour.

The ideal approach depends on factors such as:

• Thickness and distribution of submental fat
• Skin elasticity
• Chin and jawline anatomy
• Age-related tissue changes
• Previous treatments
• Desired recovery time during your stay in Korea

How Many Sessions Are Needed?

Results do not appear immediately. After treatment, the body needs time to metabolize and eliminate the treated fat cells.

In many cases, contour changes gradually become visible over approximately 4 to 8 weeks. While some patients may see improvement after one session, a series of 2 to 3 sessions may be recommended for more satisfactory contouring, depending on the amount of fat and the patient’s treatment goals.

During a consultation, your doctor should assess the thickness of the fat layer and determine the appropriate injection depth, dose, treatment interval, and whether additional procedures may be beneficial.

Important Considerations for Medical Tourists

If you are traveling to Korea for double chin treatment, plan your itinerary with recovery time in mind. Even with treatments designed to minimize discomfort, temporary swelling, bruising, tenderness, or numbness may occur.

Before booking your procedure, ask your clinic about:

• Recommended length of stay in Korea
• Expected swelling and bruising timeline
• Whether follow-up visits are necessary
• When you can fly, exercise, or resume social activities
• Whether you are a candidate for injections, skin tightening, or a combined approach
• Potential risks, contraindications, and aftercare instructions

A thorough in-person consultation with a qualified medical professional is necessary to determine whether treatment is appropriate for you.

A Personalized Approach to Double Chin Contouring

A double chin can affect the perceived balance of the face and the definition of the jawline. However, the best treatment is not always the same for every patient.

At HEV Dermatology, treatment planning begins with an assessment of your facial anatomy, submental fat volume, skin elasticity, and travel schedule. By selecting the appropriate injection technique and considering complementary skin-tightening treatments when needed, patients can pursue a safer and more practical non-surgical contouring plan.

Note: This article was translated and published from the original with consent from the author.