📚 Facial Space Refining · Series Contents

• 1. Understanding Facial Space

  • 1.1 Self-Diagnosis for Facial Space

• 2. Space Created by Muscles

  • 2.1 Masseter & Temporalis Botox

  • 2.2 Salivary Gland Botox

• 3. Space Created by Fat

  • 3.1 Sagging Fat · Ulthera

  • 3.2 Fat Dissolving Injections (Current Article)

• 4. Facial Space Designing

  • 4.1 Designing Steps

Try gently pinching the area under your chin. If you feel a thick pocket of fat that stays right there whether you lie down or sit up — that’s not sagging skin, but rather congested fat.

This kind of localized fat doesn't easily go away with dieting, nor does it vanish by lifting it up. There is a specific way to dissolve just that localized area.

Quick Answer: Fat that you can pinch under your chin and remains pooled regardless of your posture is 'congested fat.' We can dissolve and refine just that spot using deoxycholic acid fat-dissolving injections.

Sagging is different from being congested

We need to separate the fat that creates extra facial space into two categories: one is the sagging fat we discussed earlier, and the other is congested fat.

• Sagging fat has migrated downward from its original position. For this, lifting treatments like Ulthera are the correct choice.

• Congested fat pools up thickly in a specific spot. A double chin is a prime example. In this case, dissolving it is the correct approach.

Confusing these two can lead to the wrong treatment. If you dissolve sagging skin, it can look even hollower, and if you only try to lift congested fat, it will simply remain there. This is why a self-diagnosis by pinching and changing postures is so important.

How Deoxycholic Acid Dissolves Fat

The key ingredient in injections that dissolve congested fat is deoxycholic acid*.

* Deoxycholic acid (DCA): A substance naturally found in our body's bile. It works to break down fat. It is the only ingredient approved by the KFDA for fat reduction purposes.

Deoxycholic acid is a type of bile acid* that our bodies naturally use to digest fat. When this ingredient is injected into areas where fat has pooled, it directly destroys the membranes of the fat cells. Once the membranes are destroyed, the fat cells die off, and their contents are gradually cleared away through the body's natural metabolic processes. A key feature of this method is that once the fat cells are destroyed, they do not regenerate.

* Bile acid: A substance produced in the liver that helps digest and absorb fats. Deoxycholic acid is one of them, using its emulsifying properties to break down fat.

Because it doesn't all dissolve at once, the treatment is typically performed dynamically over multiple sessions at intervals of 2 to 4 weeks. Swelling or bruising may occur for a few days after the injection. The double chin is the classic area where the original product first received treatment approval, making it the very first spot people think of when it comes to fat-dissolving injections.

Choosing safely comes first

The ingredients in fat-dissolving injections are very important. There are many injections on the market containing a mix of various ingredients, which makes checking for safety and official approval absolutely essential.

• Deoxycholic acid (DCA) is a leading ingredient approved by the KFDA for fat reduction. It directly destroys fat cell membranes, making it the primary choice to consider.

• Cholic acid (CA)* belongs to the same bile acid family, but is known in clinical practice to cause less swelling while still delivering excellent results, so they are often used together.

• We do not recommend cocktail injections with unclear origins or ingredients. For your safety, always confirm exactly what is going into the injection first.

* Cholic acid: A type of bile acid. While it breaks down fat, it is known to cause less irritation and swelling compared to deoxycholic acid.

In my clinical practice, based on treatment information established by academic and KFDA guidelines, I perform the procedure by precisely mapping the area to be dissolved and the location of surrounding nerves. Checking the depth and position with extreme delicacy is crucial, especially since nerves pass through the under-chin area. Rather than guaranteeing a specific outcome, I always explain beforehand that results can vary depending on fat distribution and skin elasticity.

Where to get treated, and what to keep in mind

The most classic area is the double chin. The original deoxycholic acid product was also first approved specifically as a submental fat treatment. Additionally, it can be used on small, localized pools of fat, such as the lower cheeks.

Another thing to remember is that fat-dissolving injections are not meant for removing large volumes of fat at once. For widespread, larger areas of fat, other methods are more suitable, whereas this injection shines in beautifully refining small, clearly defined pockets of fat. Therefore, rather than expecting "major weight loss," it is best to view this as a finishing touch to cleanly sculpt your facial contours.

Conversely, if sagging skin is the main cause of the extra facial space, fat dissolving is not the right choice. It is an area that needs to be lifted, not dissolved. That is why we always begin with the same step: identifying whether your facial space is caused by congested fat first — that’s where the correct treatment pathway begins.

Frequently Asked Questions

Q. Can I see results with just one session?

It typically requires multiple sessions spaced 2 to 4 weeks apart rather than a single treatment. The changes happen gradually as the fat cells die off and are cleared through metabolism.

Q. Does the dissolved fat ever come back?

The fat cells that have been destroyed do not return. However, if you experience significant weight gain, the remaining fat cells can enlarge, so maintaining a healthy lifestyle after the treatment helps sustain the results.

Q. Is this suitable for a sagging face?

We do not recommend this for sagging facial space. If you dissolve fat in an area that is sagging, there will be less support, which can make the area look even more hollow. For sagging skin, lifting treatments designed to pull the skin upward are the correct choice.

Further Reading

• Fat Dissolving Injections: why you shouldn’t trust them unless they are DCA-based (bile acid),

• Buccal Fat Dissolving Injection efficacy: why simply reducing volume can cause more sagging

• Double Chin Fat Dissolving Injections (DCA) vs. Ulthera [Excess Fat vs. Loss of Elasticity]

• Double chin fat-dissolving injections: will the fat return if I gain weight?