Does Under-Lip Hollow Filler Actually Work?
If your nasolabial folds are already filled but your mouth still looks tired in photos, the real problem might be a small shadow just under your lower lip.
Planning a trip to Seoul?
Last updated: July 2026
If you've already had filler in your nasolabial folds — the creases that run from your nose to the corners of your mouth — and your face still looks tired in photos, you're not imagining it. The real culprit is often a spot most people never think to treat: the small hollow just below the lower lip, right above the chin crease.
That shadow does more to how tired your mouth looks than most patients realize. In this article, we'll cover what under-lip hollow filler actually is, how it works, what recovery looks like, the risks, and how the cost compares with filling your nasolabial folds instead.
What Is Under-Lip Hollow Filler?
Under-lip hollow filler is a small, targeted injection of hyaluronic acid (HA) filler into the hollow between your lower lip and your chin — the area just above what's sometimes called the mental crease. It's a different treatment from nasolabial fold filler, even though the two areas sit close together on your face.
Nasolabial filler adds volume directly into a wrinkle to smooth it out. Under-lip hollow filler works differently: it fills a shallow dip, or a flat spot, so the surface around your mouth catches light more evenly instead of casting a shadow. Think of it as changing the terrain rather than erasing a specific line.
How Does It Actually Work?
The short answer? It's about light and shadow, not wrinkle depth.
When the area under your lower lip is hollow, it creates a small shelf that catches shadow — especially under overhead lighting or in photos taken from slightly below eye level. That shadow can make nasolabial folds and marionette lines (the lines running from the corners of your mouth toward your chin) look deeper than they actually are, even if you've already had those areas filled.
Filling the hollow itself changes the surface, not the wrinkle. Once the area is more level, light reflects more evenly across your lower face, and the surrounding lines can read as softer — without a provider touching them directly.
There's a mechanical piece to this too. The mentalis (the chin muscle that contracts every time you purse your lips or drink from a cup) sits right under this area and moves constantly. That's part of why:
- Dosing is small on purpose: most providers use roughly 0.1 to 0.15cc per side, capping around 0.3cc total — a fraction of the 1cc or more that's typical for nasolabial folds.
- More isn't better here: overfilling this specific spot can create a firm-looking bump when you talk or smile, since the muscle keeps moving under the filler.
- Technique matters as much as volume: a provider experienced with this area will often get a more visible change from less product than one who treats it like a standard line-filling job.
What to Expect: Timeline After Treatment
Most people go straight back to normal activities the same day, though this particular spot tends to show a bit more visible swelling than other filler areas at first.
- Day of treatment: mild swelling is common, and the area can look slightly puffy or overfilled — that's expected, not a sign anything went wrong.
- Day 1 to 2: swelling usually peaks, and the treated area may look more prominent than you're expecting. Bruising is possible, but not everyone gets it.
- Day 3 to 5: swelling starts settling, and the shape typically starts looking more like the final result.
- Week 1 to 2: most of the visible change has resolved, and you can judge the result more accurately.
Results typically last 8 to 12 months — a bit shorter than nasolabial filler, mostly because of how much this area moves throughout the day. Individual results vary depending on your anatomy, how quickly you metabolize filler, and the specific product used.
Side Effects & Risks
Like any filler treatment, this comes with real risks and trade-offs, even though the volume used is small.
- Swelling and mild puffiness: common in the first 24 to 48 hours; usually settles within about a week.
- Bruising: less common here than in some other areas, but possible, since small blood vessels run through the midline of the chin and lower lip.
- Firmness or a lump-like feeling when talking: usually related to overfilling — one reason experienced injectors keep the dose conservative here.
- Asymmetry: can happen if the muscle pulls differently on each side; usually correctable at a follow-up visit.
If you notice spreading redness, fever, or pain that gets worse instead of better in the days after treatment, seek medical care right away — those aren't typical filler side effects.
If a firm spot is still noticeable after two weeks, it can usually be softened with hyaluronidase (an enzyme that dissolves HA filler), so this isn't a permanent situation if the initial result isn't quite right.
How Much Does It Cost?
Because under-lip hollow filler uses so little product — often a third of what's used for nasolabial folds — it tends to cost noticeably less per visit, though pricing always depends on the clinic, the product used, and how much correction your case actually needs.
Here's roughly how the two compare:
| Area | Typical Volume | Typical Longevity | Best For |
|---|---|---|---|
| Under-lip hollow | ~0.2–0.3cc total | 8–12 months | Softening shadow-driven marionette lines and nasolabial folds without touching them directly |
| Nasolabial folds | 1cc or more | Longer-lasting, varies by provider | Filling the wrinkle itself directly |
Pricing varies by clinic, product, and how much filler your case actually needs — a consultation is the best way to get an exact number for your face. You can see current offers at /en/promotion.
Who's a Good Candidate?
You might be a good candidate if:
- you've already had nasolabial or marionette line filler and still feel like your lower face looks tired or dragged down
- you notice a visible dip or shadow just under your lower lip, especially in photos taken from below
- you want a subtle change rather than a dramatic one — this isn't a treatment that transforms your whole face on its own
It's probably not the right starting point if your main concern is deep nasolabial folds themselves rather than the shadow around them — in that case, your provider may recommend treating both areas, or starting with the folds first. And if you have a history of cold sores or an active skin infection in the area, talk to your provider about timing before booking.
The Bottom Line
- the hollow just under your lower lip can make nasolabial folds and marionette lines look deeper than they actually are
- filling it usually takes a fraction of the volume used for nasolabial folds — often around 0.2 to 0.3cc total
- results last about 8 to 12 months, and swelling in the first few days is normal, not a red flag
Like any procedure, it comes with trade-offs — namely, more visible short-term swelling and a real risk of looking overfilled if the dose isn't kept conservative. Ultimately, the choice depends on your anatomy, your goals, and what you've already had done elsewhere on your face.
If you're considering under-lip hollow filler, a consultation is the best way to find out whether it's the right move for you. Beautystone is a dermatology clinic in Seoul's Hapjeong area — see current offers at /en/promotion.
Frequently Asked Questions
Q1. Does filler under the lip hurt?
Most people describe it as pressure rather than sharp pain, especially since providers typically use a numbing cream or a lidocaine-containing filler beforehand. The area sits close to nerve endings around the mouth, so some pinching during injection is common, but it's brief.
Q2. How long does under-lip hollow filler last?
Most people see results for about 8 to 12 months, which is somewhat shorter than nasolabial filler because the area moves constantly with the mentalis muscle. Individual results vary based on your metabolism and the specific product used.
Q3. How much does under-lip hollow filler cost?
It typically costs less per session than nasolabial filler since the volume used is much smaller, often a third or less. Exact pricing depends on the clinic and product; a consultation is the best way to get a number specific to your case, and you can check current offers at /en/promotion.
Q4. Will it look unnatural or lumpy when I talk?
It shouldn't, as long as the dose stays conservative. Because the mentalis muscle moves this area every time you talk or purse your lips, overfilling is the main reason this treatment can look lumpy, not the treatment itself. An experienced provider keeps volume small and builds up gradually if needed.
