How is the modified Russian lip (Korean-style) different from the original Russian lip, and why does a check after 4 weeks help?

Director Kim Serim · 2026.11.08

Russian lip is a design that places filler across the whole front of the red lip to raise it upward and add forward fullness. At Serene Clinic, the modified Russian lip, a Korean-style approach, does not fill the whole front. Small amounts go only on the inner, mucosal side, so lips that were curled inward turn slightly outward (eversion). The mucosal side has weak support, so too much filler can make the lips look droopy when you talk a few weeks later, which is why we start a little under. Swelling usually settles in about a week, so a touch-up to fill any gaps is done after 1–2 weeks. After 4 weeks, we recommend coming back, if you can, to check whether any area has given way beyond what the lip's support structure can hold.

At a glance

Original Russian lip: Fills the whole front of the red lip to lift it and add forward volume
Modified Russian lip (Korean-style, Serene Clinic): Small amounts at a few mucosal points to turn curled-in lips outward
Ratio: Serene Clinic trend: upper:lower about 1:1.1–1.2; a study of 330 Koreans rated 1:1.25 most attractive [1]
Shape: No lumpy tubercle in the center of the upper lip; corners lifted only slightly
Injection depth: Just under the mucosa, shallower than the labial arteries, entering along the surface
Checking results: Right after: safety and obvious asymmetry; after 1–2 weeks (once swelling settles): touch-up for gaps; after 4 weeks: return if possible to check for any area giving way
If slight drooping appears: If tension loss causes slight drooping, fine adjustment with hyaluronidase is possible

How is the Russian lip different from the modified Russian lip?

Russian lip is known as a design that places filler in closely spaced vertical lines across the front of the red lip to prop it upward (tenting). The red lip gets taller and fuller toward the front, so the outline looks sharp in front-facing photos.

The modified Russian lip (Korean-style Russian lip) at Serene Clinic shares the name, but the filler goes to a different place. Instead of filling the whole front, we place small amounts at a few points on the inner mucosal side, where the upper and lower lips meet. Lips that were curled inward then turn slightly outward, and more of the red part shows. This is called lip eversion.

Filling the front makes the volume noticeable. The modified Russian lip, which fills the mucosal side, aims for lips that look naturally that way rather than lips that stick out.

What lip ratio and shape look natural today?

There is no single right ratio between upper and lower lip thickness. A study that adjusted images of Western women's faces found 1:2 most attractive [2], while in a survey of 1,011 people in 35 countries, 1:1 was the most common choice [3]. In a study of 330 Koreans, 1:1.25, where the upper lip is about four-fifths of the lower, was rated the most attractive and healthy-looking [1].

At Serene Clinic, the shape many patients ask for now is around 1:1.1–1.2, with a fuller upper lip. Because studies differ in who they asked and how, we do not aim for one number. We find the ratio in relation to the length below the nose, the chin, and the width of the mouth.

We look at two more things in the shape. The rounded center of the upper lip (the tubercle) should flow in a smooth curve instead of bulging like a lump, and the corners of the mouth should be lifted only slightly, without exaggeration.

Which layer of the lip does the filler go into?

In the modified Russian lip, the filler goes into the shallow layer just under the mucosa (the submucosa). The upper and lower labial arteries run across the lips, mostly on the mucosal side of the lip muscle (orbicularis oris) or within the muscle, and rarely just under the skin. Their depth varies a lot from person to person, so no layer can be called completely safe [4].

So the needle enters upright at the lip border for a short distance, then, without going deep, moves along just under the surface toward the mucosal side and places the filler shallower than the artery. This avoids a deep path running alongside the artery. A method of vertical needle entry with ultrasound guidance and injection into the submucosa has also been reported [5].

Even so, the risk of vascular complications does not disappear. If pain keeps getting worse after the procedure, or the lips or nearby skin turn white, contact the clinic right away.

Does more filler on the mucosal side turn the lips out more?

No. In our practice, as mucosal filler increases, eversion rises sharply with the first small amount and soon reaches a limit. Beyond that, extra filler often just adds bulk instead of turning the lips out further.

The bigger problem shows up over time. Right after the procedure, the eversion may be enough and the line neat, but around 3–4 weeks later, when talking or smiling, the mucosal side of the upper lip can look puffy and the line can seem to sag. It is more noticeable when the mouth opens than at rest. We have seen similar sagging about a month later when the mucosal side was filled to widen the lips.

If too much filler goes into the mucosa on one side, the fibrous tissue supporting that side can loosen later, causing drooping, and the asymmetry may show again. So at Serene Clinic, we do correct asymmetry and create eversion, but we control the amount so that one side or the mucosal side does not get too much.

Why can lips look droopy a few weeks later?

The structure inside the lips explains part of it. In a cadaver study where dye was injected into the lips, thin vertical walls (septa) formed borders that divided each lip into several front and back compartments, and the mucosal compartments were larger than the skin-side ones [6]. The lips also have no separate membrane layer like the cheeks; instead, connective tissue runs like a net from the mucosa through the muscle to the skin and holds both the shape and the movement of the lips [4].

Serene Clinic thinks of this connective tissue like the ropes that hold a tent in place. When a lot of filler goes into the mucosal compartments and stretches this structure, it relaxes in that stretched state over a few weeks. When you talk or smile, the muscle moves, but the poorly supported mucosal volume cannot keep up and appears to stay low. This is a hypothesis based on clinical observation, not a proven mechanism.

A recent review also noted that too much lip filler may affect the movement of the muscles around the mouth, speech, and smiling, and that filler results are still mostly judged from still photos. The authors themselves describe this as a hypothesis that needs testing [7].

When and how are the results checked?

At Serene Clinic, a photo taken right after lip filler is not the result but one frame of the process. Right after, we only check that the filler went in safely and that there is no obvious asymmetry. Swelling usually settles in about a week, so a light touch-up to fill any gaps is done after 1–2 weeks.

After 4 weeks, we recommend coming back once more for a recheck if you can. What we look for then is not swelling but whether the mucosal volume has gone beyond what the lip's support structure can hold and given way anywhere. We look beyond the front view: the profile, the mouth slightly open, a smile, and saying "ee" and "oo." If slight drooping has appeared because tension on the mucosal side has decreased, a fine adjustment is possible with a very small amount of hyaluronidase to reduce just that area. This does not dissolve all the filler.

Rather than adding more to get it right in one go, starting a little under, filling gaps after 1–2 weeks, and checking after 4 weeks that nothing has given way gives more stable results.

Does it help to bring a photo of the lips I want?

Yes, it helps. How much you want the corners of the mouth lifted, what upper-to-lower lip ratio you prefer, and whether you like a defined tubercle in the center of the upper lip all differ from person to person. A photo of the lips you like shows these preferences more precisely than words, so it is easier to match the direction you want.

That said, we do not copy the lips in a photo as they are. The doctor looks at the shape and thickness of your own lips and how they fit with your whole face, makes an overall judgment, and then discusses with you which parts of the photo to keep and which to adjust.

Prices (as of the November 2026 menu)

Domestic Purefill 1cc (4-month retouch)	165,000 KRW
Imported Belotero 1cc	385,000 KRW
Imported Restylane 1cc	440,000 KRW
Imported Juvederm / Imported Neuvia 1cc	550,000 KRW
Hyaluronidase	110,000 KRW
Hyaluronidase + ultrasound consultation	189,000 KRW

The amount and product you need, and whether any adjustment is needed at the recheck, are explained after we see your lips.

Frequently asked questions

Will the modified Russian lip make my lips look much bigger?

The modified Russian lip shows more of the red part that was curled in rather than pushing the lips forward, so it feels more like a clearer lip shape than a size change. The amount is decided based on your lip thickness and how much change you want.

Do I have to come for the check after 4 weeks?

It is not required, but we recommend it. Swelling usually settles in about a week, but drooping caused by the mucosal support giving way sometimes only shows after 3–4 weeks. Looking at how the lips move when you talk after 4 weeks lets us notice slight drooping or asymmetry.

Can I get this if I still have lip filler from before?

We first check how much filler remains and where. If needed, we look with ultrasound, and if a lot is already on the mucosal side or the lips are drooping, we reduce it first and plan again after some time.

If my lips look droopy, should I add more filler?

Drooping on the mucosal side sometimes comes from too much filler, not too little. Adding more can make it worse, so we first consider reducing the excess.

References

This article is general medical information. Results and how long they last vary from person to person. Any treatment can cause side effects such as redness, swelling or pain, so please decide after a consultation.