A double chin can come from fat, loose skin or both. This guide compares fat-dissolving injections with HIFU lifting such as Shurink Universe and Ulthera Prime, so you can match the treatment to the cause.
Fat-dissolving injections and HIFU treat different causes of a double chin. Fat-dissolving injections break down a small pocket of fat under the chin over 2–4 sessions, with swelling for 2–5 days. HIFU (high-intensity focused ultrasound), such as Shurink Universe or Ulthera Prime, tightens loose skin and the deeper supporting layer with no real downtime. Fat responds to injections; laxity responds to HIFU. At Dernia Clinic Myeongdong in Seoul, fat-dissolving injections start from ₩69,000 per area and Shurink Universe from ₩149,000 for 300 shots (KRW, excluding 10% VAT).
Prices are in Korean won, exclude 10% VAT and are confirmed by a doctor at consultation.
Fat-dissolving injections vs HIFU: the short answer
If your double chin is mainly a soft pocket of fat you can pinch, fat-dissolving injections are usually the more direct treatment. If it is mainly loose skin or a jaw-to-neck angle that has softened with age, HIFU lifting is usually more helpful. Many people in their thirties and forties have a little of both, and the two treatments are often combined.
The distinction matters because removing fat from under loose skin does not tighten it, and tightening skin does not remove a stubborn fat pocket. Matching the treatment to the cause is the key to a result you can actually see.
What causes a double chin?
- Submental fat: a pocket of fat under the chin that can be genetic and persist even at a healthy weight.
- Skin and SMAS laxity: loosening of the skin and the deeper supporting layer with age, blurring the jawline.
- Bone structure: a small or recessed chin makes the under-chin area look fuller.
- Posture and weight: weight changes and looking down at a phone can make the area look heavier.
A doctor checks each factor by feeling the area, watching how the skin moves and looking at your profile. See double chin treatments for more.
How do fat-dissolving injections work?
Fat-dissolving injections place a solution into the fat pocket that breaks down fat cell membranes. Over the following weeks, your body clears the treated fat. Because each session treats part of the pocket, most people need 2–4 sessions spaced two to four weeks apart. Several formulations are used in Korea, and your doctor explains which one they recommend.
- Treatment time: about 15–20 minutes.
- Downtime: swelling, tenderness and sometimes bruising for 2–5 days.
- Result: gradual reduction over several weeks after each session.
Read more on the fat-dissolving injection page.
How does HIFU work on the double chin?
HIFU focuses ultrasound energy at set depths under the skin, creating tiny heated points that contract tissue and stimulate new collagen. Under the chin and along the jaw, this tightens the skin and the deeper SMAS layer, sharpening the jaw-to-neck angle. Some HIFU cartridges also reach the fat layer, which can help slightly with fullness, but HIFU is mainly a tightening treatment rather than a fat-removal one.
At Dernia, HIFU options include Shurink Universe, a Korean HIFU device often used for the jaw and under-chin, and Ulthera Prime, which includes real-time ultrasound imaging.
Fat-dissolving injections vs HIFU compared
| Fat-dissolving injections | HIFU (Shurink / Ulthera) | |
|---|---|---|
| Main target | Under-chin fat | Loose skin and SMAS |
| Method | Injection | Focused ultrasound, no needles |
| Sessions | Usually 2–4 | Usually one, repeated periodically |
| Downtime | Swelling 2–5 days | None; mild redness or tenderness |
| Result timing | Gradual over weeks | Some tightening early, more over 2–3 months |
| Duration | Treated fat cells cleared; weight still matters | Months to about a year depending on device |
Who is a good candidate for each?
Usually a good fit
- Injections: a pinchable fat pocket at a stable weight
- Injections: younger people with good skin elasticity
- HIFU: early loosening along the jaw and under the chin
- Both: fat plus mild laxity
Talk to the doctor first
- Significant loose skin, where fat reduction alone may leave laxity
- A recessed chin, where chin support may help more
- Pregnancy, breastfeeding or active infection
- Thyroid or neck swelling that needs medical assessment first
What happens on treatment day
- English consultation. A licensed doctor checks fat, skin laxity and chin structure, then agrees a plan and price with you.
- Marking. The fat pocket or HIFU treatment zone is marked on the skin.
- Comfort measures. Injections may use ice or numbing; HIFU may use numbing cream for comfort.
- Treatment. Injections take about 15–20 minutes. HIFU passes take roughly 20–40 minutes depending on shots or lines.
- Aftercare. You receive written aftercare in English, including what to expect with swelling.
A typical fat-dissolving appointment lasts about 30–45 minutes including consultation and marking. HIFU appointments take a little longer if numbing cream is used. Either way, you can walk out and continue your day, although under-chin swelling after injections is easier to manage with a quiet evening.
Results timeline
Swelling after fat-dissolving injections can make the area look fuller for the first few days, which surprises some people. As swelling settles over the first week, the body begins clearing the treated fat, and visible reduction usually becomes clearer three to four weeks after each session. The full effect is best judged a month or two after the final session.
HIFU often gives a slight sense of tightness on the day, but the main change comes as new collagen forms. Most people notice a cleaner jawline over four to twelve weeks. How long it lasts depends on the device and your skin: Shurink Universe results usually last about three to six months, and Ulthera Prime results often last about a year. Your doctor may suggest repeating HIFU periodically to maintain the contour.
Lifestyle matters too. Significant weight gain can enlarge remaining fat cells, and poor posture can make any double chin look worse. Keeping a stable weight and protecting the skin from sun damage helps both treatments last longer. See Shurink Universe results for a fuller picture.
Can you combine fat-dissolving injections and HIFU?
Yes. A common sequence is HIFU first to tighten, followed by fat-dissolving injections on the same day or a separate visit, or the other way round depending on swelling. Combining them addresses both the fat and the skin, which often gives a cleaner jawline than either alone. The V-Line Contour Package brings these together. For more on device lifting, read Ulthera Prime vs Shurink Universe.
Is it safe? Risks and side effects
- Fat-dissolving injections: swelling, tenderness, numbness, firmness and bruising are common for several days. A temporary tight feeling when swallowing can occur. Rarely, irritation of the nerve that controls the lower lip can cause a temporarily uneven smile, and skin irregularities can occur.
- HIFU: mild redness, swelling and tenderness are common. Rarely, small burns, temporary numbness or nerve irritation can occur if energy is placed incorrectly, which is why a doctor sets depth and energy.
Read side effects and when to contact us before your trip.
How much does double chin treatment cost in Seoul (2026)?
| Option | Details | Price (KRW) |
|---|---|---|
| Fat-dissolving, one facial area | One session, e.g. under the chin | ₩69,000 |
| Fat-dissolving, two facial areas | Under the chin and jowls | ₩129,000 |
| Fat-dissolving, 3-session course | One facial area | ₩189,000 |
| Shurink Universe, 300 shots | Jawline or under the chin | ₩149,000 |
| Shurink Universe, 1,200 shots | Full face, under the chin and neck | ₩449,000 |
| Ulthera Prime, 100 lines | One target area, such as under the chin | ₩390,000 |
Prices exclude 10% VAT. The tourist VAT refund on cosmetic procedures ended on January 1, 2026 — see the VAT refund guide. More on the fat-dissolving price page.
Planning double chin treatment around your Seoul trip
- Book ahead. Send your dates and a side-profile photo through our consultation form.
- Avoid your arrival day. Treat from day two once you have rested.
- Short trip? HIFU fits one visit. Injections need a series, so start in Seoul and continue later.
- Getting here. Dernia is near Myeongdong Station (Line 4) and Euljiro 1-ga Station (Line 2).
Flying home? Most people can fly the day after HIFU. After fat-dissolving injections, under-chin swelling may still be noticeable but is not usually a reason to delay travel. Our aftercare guide explains what to expect.
Frequently asked questions
Is HIFU or fat-dissolving better for a double chin?
Fat-dissolving injections are better for a pinchable fat pocket. HIFU is better for loose skin and a softened jawline. Many people benefit from both.
How many fat-dissolving sessions do I need for a double chin?
Usually 2–4 sessions, two to four weeks apart, depending on the size of the fat pocket.
Does HIFU melt fat under the chin?
HIFU is mainly a tightening treatment. Some cartridges reach the fat layer and may help slightly, but injections target fat more directly.
Is there downtime after fat-dissolving injections?
Expect swelling, tenderness and sometimes bruising for about 2–5 days. HIFU has no real downtime.
Can I combine HIFU and fat-dissolving injections?
Yes. Your doctor decides the order and timing so you get both tightening and fat reduction.
How much is double chin treatment in Seoul?
At Dernia Clinic Myeongdong, fat-dissolving injections start from ₩69,000 per area and Shurink Universe from ₩149,000 for 300 shots, excluding 10% VAT.
Treating a double chin in Seoul?
Send us a profile photo and your travel dates. A doctor examines you in person, explains whether fat, laxity or both are involved, and confirms your plan and price in English.
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This article is for general information and does not replace a medical consultation. Results vary between individuals, and suitability, treatment plan and final price are confirmed by a licensed doctor after an in-person examination. Dernia Clinic Myeongdong does not publish patient testimonials or before-and-after claims.