Uneven filler, and only offered surgery? Get assessed first

When uneven swelling after filler is an emergency: act at once

Most unevenness after filler is not an emergency, and the rest of this page is about the unevenness that is not. A few signs are, and they come before any talk of waiting, scanning or surgery. The lips and the area under the eyes are risk areas for a blocked blood vessel: the arteries that supply the lips run inside them, close to where filler is placed, and vessels below the eye and beside the nose connect with those that supply the eye.

Urgent: a change in vision or eye pain after filler: call 995 now. Skin that turns pale, dusky or mottled, or pain that is getting worse, needs urgent assessment by the doctor who injected you, or at A&E, now. See the warning signs of a blocked blood vessel after filler.

Skin that is dying after a blocked blood vessel (necrosis) is an emergency. It needs urgent, more intensive care than a lump does, starting now.

What to look for, and what to do

• Colour. A patch on the lip, the skin around the mouth, under the eye or on the cheek that turns white, then dusky, purple or mottled: urgent assessment by the doctor who injected you, or at A&E, now.
• Pain. Pain that is severe, or getting worse rather than settling: urgent assessment by the doctor who injected you, or at A&E, now.
• Eyes. Blurred or lost vision, double vision, or pain in or around the eye: call 995 now.
• Stroke signs. New weakness of the face, an arm or a leg, or slurred speech: call 995 now, and do not travel to a clinic first.
• Infection. A red, hot, painful, swollen or draining lump, or a fever: a doctor the same day; if no doctor can see you today, A&E. Spreading redness with a fever, feeling faint, confused or very unwell, or swelling around the eye with pain: call 995 or go to A&E now.
• Difficulty breathing, a tight throat, swelling of the tongue or throat, or swelling that spreads quickly across the face, after any injection, including hyaluronidase, can be a serious allergic reaction: call 995 now. Itch, hives or swelling that spreads beyond the treated area: contact the clinic that injected you the same day.

Signs of a blocked vessel usually appear during or soon after the injection, sometimes later: act whenever they appear, whoever injected the filler and whatever it was. Do not wait for a reply to a message, a booked review or the colour to settle, and if your vision is affected, do not drive yourself.

Where the filler is hyaluronic acid, a blocked vessel is treated at once with high doses of hyaluronidase, rather than the low or moderate doses used for non-urgent problems (Kroumpouzos and Treacy 2024), and dissolving is never delayed for a skin test. A blocked vessel is never treated with the Sculpting mode or any other laser. A red, hot or tender lump needs a doctor the same day (A&E if no doctor can see you today) and is treated medically first, before any dissolving, any laser and any talk of surgery, and infected hyaluronic acid is dissolved only once the infection is under control.

Uneven filler, and offered surgery? Read this first

Patients come to Dr Sin Yong after being told that uneven filler has to be cut out, that the way to even it up is more filler on the other side, or that nothing more can be done. Before you agree to an operation, know what it means:

• A scar. Every cut through the skin of the face heals with a scar.
• A dent. Cutting out a lump takes tissue with it, and the area can heal hollow or uneven.
• Nerve injury. Nerves that give the face feeling and movement run close to where filler sits. An injured nerve can leave numbness, or weakness in a smile, a lip or a brow.
• Product left behind. Filler spread through tissue is hard to remove completely.
• No way back. Tissue that has been cut out cannot be put back.

With unevenness there is a further catch. An operation works on one side of a face you want to match: it takes tissue from the fuller side, and that side then heals with a scar and can heal hollow or uneven, so the two sides can end up different in a new way. Filler that has spread or moved is hard to separate from the tissue around it, and some can be left behind.

Where one side is fuller because of excess, a lump or moved filler, more filler on the other side is not the answer either. It makes both sides heavier and leaves that filler where it is, as set out below.

In Dr Sin Yong's practice, almost every hard lump is treated without surgery. If yours is one of the few that needs surgery, you are told plainly, and why. He maps both sides with ultrasound, dissolves the hyaluronic acid excess in stages after a skin test, and treats Sculptra, Radiesse, Ellansé, silicone and other material that cannot be dissolved with the Sculpting mode of Time Freeze Laser LCLR®, without an incision. What an operation involves is set out in do I need surgery for uneven filler, further down this page.

“Dissolving filler is not an undo button.”

Dr Sin YongOn what dissolving can and cannot do

Why filler looks uneven: the usual causes, and how to tell them apart

Uneven filler usually comes down to one of a few causes, and some people have more than one. The pattern points to the likely cause; the scan shows what is actually there.

Swipe sideways to see the whole table.

When the face was not symmetrical to begin with

No face is an exact mirror image: the brows, eyes, cheeks, lips and jaw usually differ slightly between the two sides. Filler placed evenly on an uneven face can make an existing difference easier to see, and filler placed to even it out can overshoot. Photographs from before any filler, examination at rest and when you smile, and the scan show which part is your own face and which part is filler. The causes of natural differences between the sides, in bone, muscle, fat and habit, are covered in facial asymmetry; this page deals with the filler.

A collagen stimulator on one side

Collagen stimulators such as Sculptra, Radiesse and Ellansé do not simply sit where they were placed: they prompt the body to build its own collagen around the product. With Sculptra that volume builds gradually after the appointment, so a side that received more, or where the product gathered, can go on filling out, and unevenness can appear or grow some time after the treatment. More on this is in uneven cheek filler, below.

Filler uneven after swelling: when to wait, and when not to

Some unevenness straight after filler is expected. Each side has its own injection points and its own bruises, and swelling is rarely the same on both sides, so the two sides are judged once the swelling has gone, not on the day. Normal swelling is most noticeable early and then eases steadily. The direction matters more than the calendar: normal swelling gets smaller, not bigger, and when the two sides are compared is decided from how the swelling has behaved, not from a fixed number of days.

Early asymmetry is documented after hyaluronic acid filler in the nose, alongside reactions where the needle went in (Caranti 2025). In a systematic review of facial filler for wrinkle correction, covering 38 studies and 3,967 people, 7,719 of 8,795 recorded complications were mild or temporary reactions where the injection was given, including swelling (1,184), hardening or stiffness (888) and nodules or irregularities (849); the authors conclude that common complications usually resolve on their own and that surgery is generally not required (Janovskiene 2024).

Reasonable to wait while it settles

• The swelling is easing steadily, a little less each time you look.
• There is a difference in fullness but no lump you can feel.
• The skin colour is normal and any tenderness is settling.

Do not wait

• The swelling is growing instead of easing, or one side settles and then swells again: have it assessed.
• A firm lump or bead has not softened as the swelling went down: have it scanned.
• Filler shows somewhere it was not placed, such as above the lip line or below the eye: have it scanned.
• The area is red, hot, painful or draining, or you have a fever: a doctor the same day; if no doctor can see you today, A&E.
• Skin turns pale, dusky or mottled, or pain is getting worse: urgent assessment by the doctor who injected you, or at A&E, now. A change in vision or eye pain: call 995 now.

Do not press hard on a lump, massage it firmly or try to even it out yourself. The normal stages are set out in filler swelling, and swelling that returns or appears long after the injection in swelling months after filler. The same causes of unevenness apply in the nose, chin and jaw, which are covered in nose filler gone wrong and chin and jawline filler gone wrong.

Uneven lip filler: when one side of the lip is bigger

Asymmetrical lip filler usually shows as one side of the upper or lower lip fuller than the other, a lip that tilts when you smile, a bead on one side, or a fuller edge above the lip line on one side. Lips swell easily, so early unevenness is common and is judged once the swelling has gone.

Lip filler often does not end up exactly where it was intended. In an ultrasound study of 126 people, the layer under the lip skin averaged less than a millimetre, hyaluronic acid filler had ended up within the lip muscle in most of those treated, and vertical injection techniques were linked with deeper deposits and signs of migration (Harris 2026). When lips stay uneven, it can be unequal amounts, filler sitting at a different depth on each side, filler that has moved beyond the border, or a lump on one side.

The lips are scanned, the fuller side is identified, and the hyaluronic acid excess on that side is dissolved in small doses after a skin test, with a review at about 48 hours before anything more. Filler that has moved above the lip line is dissolved where it lies, rather than dissolving the whole lip. Where one side is fuller because of excess, a lump or moved filler, building up the thinner side to match makes the whole lip bigger and leaves that filler where it is. Silicone or polyacrylamide gel in the lips cannot be dissolved, but it can still be treated without an incision: Dr Sin Yong treats it with the Sculpting mode of Time Freeze Laser LCLR®.

A patch on the lip that turns pale, dusky or mottled, or pain that is getting worse, needs urgent assessment by the doctor who injected you, or at A&E, now. A lump in the lip is covered in lip filler lumps, filler above the lip line in lip filler migration, and other problems in lip filler gone wrong.

Uneven tear trough filler: one under-eye fuller, puffier or bluer

Under the eyes, unevenness usually shows as one side puffier, a ridge or bump under one eye, a hollow that still shows on one side, or a blue-grey tint on one side. The skin there is thin, so small differences in amount or depth show.

An uneven contour is a recognised problem after under-eye filler. A meta-analysis of tear trough filler, 31 reports covering 2,556 people, found a lump or uneven contour in 5.3% (Liu 2023).

The causes are the same as elsewhere, with two of their own. Puffiness on one side can be fluid rather than filler, held in an area below the eye that drains poorly, and filler there can look like an eye bag. A blue-grey tint on one side can mean hyaluronic acid sitting too close to the thin skin. The scan tells filler from fluid, fat and loose skin before anything is dissolved.

Under-eye filler is dissolved in small, staged doses after a skin test, because the area is small and dissolving more than the excess can leave the hollow showing again. Puffiness that turns out to be fluid, with no filler behind it, needs a different plan, and it is never balanced by adding filler to the other side. Swelling around the eye with pain: call 995 or go to A&E now. A change in vision or eye pain after filler: call 995 now. More is in under-eye filler gone wrong.

Uneven cheek filler: one cheek higher, fuller or heavier

One cheek fuller than the other, one cheekbone higher, or one side of the midface heavier when you smile. Cheek filler is often placed in more than one layer, and cheeks often carry more than one product over the years, so the difference can come from a different amount, a different depth or a different product on each side.

Two things make cheek unevenness build up over time. Filler lasts longer than many people expect: in a systematic review of 24 studies (1,410 patients), the studies using 3D imaging found 60–86.4% of hyaluronic acid still present at 12 months and 50–86% at 24 months (de Castro Costa 2025), so a top-up on one side can add to filler that has not gone. And in an MRI study of 14 people with known injection histories, hyaluronic acid filler measured about 2.8 times the volume injected, in regions that included the malar area, the midcheek and the cheekbone; the authors suggest that some fillers expand after injection (Issa 2026).

A collagen stimulator on one side adds a third. Sculptra (poly-L-lactic acid) works through a controlled inflammatory reaction in which the body builds its own collagen around the particles; as the polymer breaks down, the collagen increases, so the volume builds gradually (Vleggaar 2014). Where more product was placed, or gathered, on one side, that side can keep filling out after the appointment. Collagen stimulators cannot be dissolved, but they can still be treated without an incision: Dr Sin Yong maps them and treats the areas of excess with the Sculpting mode of Time Freeze Laser LCLR®.

Arteries in the cheek, especially towards the side of the nose and below the eye, connect with the vessels that supply the eye: a change in vision or eye pain after cheek filler means calling 995 now. Overfilled, heavy or moved cheek filler is covered in cheek filler gone wrong.

Ultrasound first: where the filler sits on each side, and how much

Uneven filler is a comparison, so both sides are scanned, not only the one that looks fuller. Ultrasound shows where the filler sits, how deep it is and how far it has spread, and what it is likely made of. Side by side, the two scans show whether one side carries more filler, the same filler at a different depth, filler that has moved, or a lump, and they show the blood vessels nearby, which guides where a needle goes.

An international consensus of 15 experts from seven specialties calls ultrasound mandatory for managing filler complications, recommends identifying fillers already in place before any further injection, and considers ultrasound guidance necessary for precise injections when treating a complication (Velthuis 2025). At one ultrasound reference centre, overcorrection and migration were among 52 non-vascular problems seen after hyaluronic acid filler, and the authors conclude that ultrasound with Doppler, which shows blood flow, helps avoid unnecessary treatment (Gonzalez 2024).

The scan shows what a lump is likely made of; it does not prove it. Where something does not look like filler, such as a cyst or a lymph node, further tests are arranged. Sometimes the scan shows that the fuller side is swelling, fluid or your own tissue rather than filler, and nothing needs dissolving. It does not measure the exact volume on each side, which is one reason dissolving is done in stages and judged on how the face looks once it has settled. Dr Sin Yong performs the scan himself, and the plan follows what it shows. More on scanning is in ultrasound-guided filler correction.

How uneven filler is treated: the excess first, in stages

1. Maps. He scans both sides himself with ultrasound: where the filler sits, how deep, how far it has spread, what it is likely made of and the vessels nearby.
2. Treats inflammation or infection first. A red, hot, painful, swollen or draining lump needs a doctor the same day, or A&E if no doctor can see you today, and is treated medically before any dissolving or laser. Hyaluronic acid in an infected area is dissolved only once the infection is under control, because dissolving never replaces treating it.
3. Dissolves the hyaluronic acid excess. He uses hyaluronidase, an enzyme that acts on hyaluronic acid only. Your allergy history is checked, including any reaction to bee or wasp stings and any earlier hyaluronidase. Before planned dissolving, Dr Sin Yong always does a skin test: a small amount of hyaluronidase is injected just under the skin to check for a reaction. A small first dose goes into the mapped excess on the fuller side, with a review at about 48 hours, and any further dose is staged from what remains. The aim is the excess, not every trace: dissolving more than the excess can leave a hollow, and then the other side looks fuller.
4. Treats what cannot be dissolved, without an incision. He treats collagen stimulators such as Sculptra, Radiesse and Ellansé, the poly-D,L-lactic acid in Juvelook, silicone and other non-absorbable fillers, layered products and excess fat graft with the Sculpting mode of Time Freeze Laser LCLR®, his own protocol on a long-pulsed 755 nm and 1064 nm laser platform, directed at the mapped material. Like any laser, it can cause blistering or a change in skin colour, so settings are chosen for your skin. Close to the eye, settings are kept conservative and the eyes are protected.
5. Reviews. Both sides are judged once they have settled, not on the day, and any further visit is planned from what is seen.

Different hyaluronic acid fillers respond differently to the enzyme. In a randomised, masked study in 9 people using small test deposits of three fillers, one cheek-volumising filler barely changed at the lowest dose and needed more than the highest dose tested, while another responded even to the lowest dose; the largest change came 30 minutes to 3 hours after the injection (Zhang-Nunes 2021). An expert review recommends low or moderate doses for non-urgent problems such as non-inflamed nodules, and notes that ultrasound guidance can make these treatments more effective (Kroumpouzos and Treacy 2024). That is why the doses are staged.

What not to do: add filler to the other side to hide a lump or moved filler

When one side is fuller because of a lump or filler that has moved, adding filler to the other side to balance it is the wrong order. It makes both sides heavier, it leaves the lump or the moved filler where it is, and it layers new product over old, which makes the next scan and the next treatment harder. A review of facial overfilled syndrome attributes it to excessive filler and poor technique, and advises scanning the fat layers before injecting and attention to filler pressure and migration (Lim 2024). Filler also stays: in one study, a small untreated test deposit of hyaluronic acid was still present 4 years later (Zhang-Nunes 2021).

He does not add filler to hide filler. Where one side genuinely has less, whether anything is added, and where, is decided once the excess has been dealt with and both sides have settled, and sometimes the answer is nothing. If filler is wanted again, it waits at least two weeks after hyaluronidase.

Filler that cannot be dissolved

Sculptra, Radiesse, Ellansé, the poly-D,L-lactic acid in Juvelook, silicone, polyacrylamide gel, PMMA and fat graft are not dissolved by hyaluronidase, which acts on hyaluronic acid only. Material that cannot be dissolved can still be treated without an incision: Dr Sin Yong maps it with ultrasound and treats the areas of excess with the Sculpting mode, as above. A blocked blood vessel is never treated with the Sculpting mode or any other laser.

Fat grafting can leave the sides uneven too. In a systematic review of facial fat grafting, asymmetry made up 4.3% and irregularities 19.1% of 298 adverse events where the fat was placed, and moderate events, asymmetry and irregularities among them, needed a retouch operation (Schiraldi 2022). Dr Sin Yong assesses excess graft by scan and treats it with the Sculpting mode, without an incision. More is in correction after fat grafting, dissolving in hyaluronidase, and lumps from every kind of filler in hard lumps after filler.

Do I need surgery for uneven filler? What an operation involves

Usually not. Get assessed first. Surgery to take filler out means cutting it out through the skin or the lining of the mouth or lip, drawing soft gel out through a needle or a small opening, or reaching it through facelift incisions. Each route has its own trade-offs, and each one changes one side of a face you want to match.

Swipe sideways to see the whole table.

One published series shows why taking filler out of the face is harder than it sounds. In 31 patients operated on for contour problems after facial filler, by excision through facelift incisions, needle aspiration or excision inside the mouth, scar tissue and the reaction around the filler made the dissection difficult; 1 had a facial nerve injury, which improved after four months, 2 had collections of blood under the skin and 1 a collection of fluid (Ghareeb 2022).

Surgery has a place. In 50 patients who had non-absorbable filler removed through a short-scar facelift under local anaesthesia, 82% had facial asymmetry beforehand; asymmetry scores improved and 62% were satisfied, and 56% tolerated the operation under local anaesthesia (Alaslawi 2022). The authors of the 31-patient series found the facelift approach more demanding but more satisfying for major deformities after repeated injections (Ghareeb 2022). An abscess may need draining, and a lump that does not look like filler on the scan may need a tissue sample. The point is the order: the decision to operate should follow an ultrasound assessment, not come before it. A scan does not delay that decision: an operation can still be done later if it is ever needed, and it cannot be undone. The operations and their published complications are covered in filler removal surgery.

Tried other treatments and almost given up?

Many patients who come to see Dr Sin Yong about uneven filler tell him they have tried almost everything else and had given up hope. Having tried other treatments does not mean nothing more can be done: what is done next depends on what the scan shows.

That history is useful. Knowing what was injected, when, and what has already been tried often explains why a problem has stayed: hyaluronidase acts only on hyaluronic acid and only where it reaches, some fillers are not hyaluronic acid at all, and swelling or fluid can look like filler. Ultrasound shows which of these applies, and the plan starts from there. For material that cannot be dissolved, Dr Sin Yong uses the Sculpting mode of Time Freeze Laser LCLR® for nodules large and small, without an incision. How each person responds varies.

If you have been told nothing more can be done, it is still worth having the area scanned: ultrasound shows what is there, and the plan is made from that. Bring any records of past treatments, product names and dates if you have them. More on this is in when filler dissolving has not worked.

How Dr Sin Yong treats uneven filler

Dr Sin Yong developed the Time Freeze Laser LCLR® protocol himself and performs every scan, every dissolving injection and every Sculpting mode treatment himself on Orchard Road. He has been invited to share his clinical expertise in Seoul, Dubai, Bangkok and São Paulo, including as a Global Key Opinion Leader.

He examines both sides at rest and when you smile, from the front and from each side, and compares them with photographs from before the filler if you have them, because some differences were there before and filler only made them easier to see. He explains the risks and limits of each option at the assessment, including waiting while the swelling is still settling, and surgery where it is needed. The aim is balance, not a mirror image. You do not need to have been treated here, and having no records of what was injected is fine; filler placed overseas is assessed in the same way, as set out in correction of filler done overseas.