Published 25 October 2026 · Reviewed by Dr Sin Yong
Aegyo-sal is the small, soft roll just beneath the lower lashes that becomes fuller when you smile. Filler is used to define it with a very small amount of soft hyaluronic acid, but the lower eyelid is the least forgiving place in the face for filler. Dr Sin Yong first checks whether it suits you, including scanning for older filler, and advises against it where it would not.
Short answerAegyo-sal filler places a very small amount of soft hyaluronic acid filler along the roll just beneath the lower lashes, to define or soften it. It suits a flat lower eyelid with good skin and no eye bags. It does not suit eye bags, a tendency to under-eye swelling, loose lower eyelid skin, or older filler still in the area. Because it is hyaluronic acid, it can be dissolved if it needs adjusting or reversing.
Dr Sin Yong prefers energy-based treatment for almost every concern that injectables are used for: FSX Laser for the skin, and the VF Lift for lifting and hollow areas. It adds no product, so there is no injected material to cause pillow face, migration or lumps. Where an injectable is the right choice, he says so and explains why.
What is aegyo-sal?
Aegyo-sal is a Korean term for the narrow, soft roll that sits just beneath the lower lashes and becomes fuller when you smile. In Chinese it is called wò cán (卧蚕), the lying silkworm, and in medical papers it is the pretarsal roll or charming roll. It is formed mainly by the part of the orbicularis oculi muscle that lies over the eyelid plate, with the thin skin over it, and it is widely seen as an attractive, youthful feature in East Asia (Hong 2025). In a survey of 385 people in Asia, including 80 specialists, a crescent-shaped roll about 5 mm wide was rated the most attractive (Chi 2024).
Aegyo-sal, eye bags and tear troughs are not the same
Swipe sideways to see the whole table.
Feature
Where it sits
When it shows most
What it is
Aegyo-sal
A narrow band right under the lashes
When smiling
Mainly eyelid muscle
Eye bags
Lower down, below the aegyo-sal
At rest, and more when looking up
Fat that has pushed forward from behind the eyelid
Tear trough
A groove from the inner corner running down and out
At rest, under overhead light
A hollow over the ligament that tethers the skin to bone (Wong 2012)
Malar swelling
Lower still, on the upper cheek
Often worse in the morning
Fluid held in the upper cheek
The difference matters. Filler that defines an aegyo-sal sits higher and closer to the surface than filler for a tear trough, and filler added above an eye bag can make the bag look larger. Tear trough filler is covered separately in the tear trough filler procedure.
Who aegyo-sal filler suits
A flat lower eyelid with little natural roll, and a wish for a softer, smiling look.
Good skin quality under the eyes, without significant looseness.
No eye bags, no swelling on the upper cheek and no history of persistent under-eye puffiness.
Realistic expectations: a subtle definition that fits the eyes, not a new eye shape.
Whether it suits you is decided at the assessment, looking at your eyes at rest and smiling, from the front and the side.
“The day you are injected is the day you look least like the result. I judge a filler at review, once the swelling has gone, and never on the chair.”
Under-eye or malar swelling. The lower eyelid drains fluid slowly, and filler in this region can make swelling worse (Funt 2011).
Older filler still present. Hyaluronic acid can stay under the eyes for years, and swelling is the most commonly reported delayed problem after under-eye filler (Trinh 2022). Adding more on top is a common route to puffiness, so ultrasound checks for it first.
Loose or crepey lower eyelid skin. Filler does not tighten skin; FSX laser is used for laxity.
Very thin skin with dark circles. Filler close to the surface can show as discoloration, the Tyndall effect (Hirsch 2006).
Pregnancy, breastfeeding, or infection around the eye. Treatment waits.
How aegyo-sal filler is done
Assessment. The eyes are examined at rest and smiling, and the lower eyelid is checked for bags, swelling and laxity.
Ultrasound. Where there has been under-eye filler before, the area is scanned to see whether any remains and where.
Planning. The line of the roll is agreed with you, smiling and at rest.
Treatment. A very small amount of soft hyaluronic acid filler is placed precisely along the line beneath the lashes.
Review. The result is judged once swelling has settled, never on the day, and any adjustment is small.
Why the layer matters
Anatomical work has shown that a small artery runs along the eyelid plate beneath this muscle, so the published advice is to place pretarsal roll filler in the layer above the muscle, not beneath it (Cong 2016). Placement in the correct tissue plane is what separates a natural roll from a visible lump (Hong 2025).
Illustrative image — not a patient.
Dr Sin Yong performs every treatment himself. The amount is deliberately conservative, because under the eye it is better to add a little later than to have to take filler away.
Risks of aegyo-sal filler
Swelling and bruising, which are common under the eyes and settle.
Puffiness or persistent swelling; in tear trough treatment, larger volumes raised the risk of swelling (Wilde 2023).
A visible bead, lump or uneven line.
Discoloration if filler sits too close to the surface (Hirsch 2006).
Lumps, migration or swelling that appear later, sometimes more than a year after treatment (Trinh 2022).
Rarely, a blocked blood vessel, which is an emergency.
Because the filler is hyaluronic acid, it can be dissolved with hyaluronidase if it needs adjusting or reversing; see under-eye filler dissolving.
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.
If the concern is tired eyes rather than a missing roll
Many people who ask about aegyo-sal are really bothered by something else: dark circles, a hollow, or crepey skin. Filler that defines a roll will not change those. R2T2 is used for pigmented dark circles, and FSX laser for loose lower eyelid skin, while a hollow tear trough is planned differently. The types are set out in dark eye circles by type.
How Dr Sin Yong approaches aegyo-sal filler
Under the eye, saying no is part of the treatment. Dr Sin Yong examines you himself, scans for older filler where there has been any, and explains whether aegyo-sal filler suits your eyes, what he would use, how much, and what decides the fee, in writing. If it does not suit, he explains why and what might help instead. Filler in other areas is covered in dermal fillers in Singapore.
Your next step
Not for emergencies. A change in vision or eye pain after filler: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: go now to the doctor who injected you, or to A&E. Do not message or book for these signs.
1. MessageWhatsApp +65 8023 7170 with what is bothering you. A reply comes from the clinic, not a bot.
2. AssessmentDr Sin Yong examines you himself on Orchard Road, with ultrasound where earlier filler is involved.
3. A plan in writingWhat he would do, what he would not, the fee factors, and the option of no treatment.
Every treatment is performed by Dr Sin Yong personally. Singapore Medical Council registered · invited to share his clinical expertise internationally for CLASSYS, DEKA, Fotona, Hironic and Ilooda.
Aegyo-sal filler is a very small amount of soft hyaluronic acid filler placed just beneath the lower lashes to define or soften the roll that shows when you smile. It aims for a subtle, smiling look. Because the lower eyelid is thin and prone to swelling, it is planned conservatively and only after the area has been assessed.
No. Aegyo-sal is a narrow roll right under the lashes, formed mainly by eyelid muscle, and it shows most when you smile. Eye bags sit lower, are formed by fat pushing forward from behind the eyelid, and show more at rest and when looking up. Filler can define an aegyo-sal, but it makes eye bags look bigger.
Wò cán, the lying silkworm, is the Chinese name for aegyo-sal: the soft roll beneath the lower lashes that becomes fuller when you smile. Requests for wò cán filler are assessed in the same way: whether the lower eyelid suits filler at all, whether older filler is still present, and how little is needed.
Yes. Aegyo-sal filler is hyaluronic acid, so it can be dissolved with hyaluronidase if it needs adjusting or reversing. Ultrasound shows where it sits, a small dose is placed into it, and the area is reviewed before more is used. The under-eye filler dissolving page explains how this is done.
Anyone with eye bags, persistent under-eye or upper-cheek swelling, loose lower eyelid skin, or older filler still under the eyes is usually better served another way. It is also deferred in pregnancy, while breastfeeding, and while there is infection around the eye.
Hyaluronic acid filler can stay under the eyes far longer than expected, and adding more on top of filler that is still there is a common route to puffiness. Where you have had under-eye filler before, ultrasound shows whether any remains and where, which changes whether and how aegyo-sal filler is done.
It can. The lower eyelid drains fluid slowly and hyaluronic acid attracts water, so larger amounts, placement too close to the surface, or filler on top of older filler raise the risk. In tear trough treatment, larger volumes were linked with more swelling (Wilde 2023). That is why very small amounts are used and the area is assessed first.
The aim is a subtle definition that fits your eyes when you smile, and whether that suits your face is discussed with you at the assessment, smiling and at rest. Responses vary from person to person, which is why the amount is conservative and the result is judged at review once any swelling has settled.
Sometimes, but they are different treatments in different layers, and combining them adds volume to an area that tolerates very little. Dr Sin Yong decides at the assessment whether either suits you; where hollowness, pigment or loose skin is the main concern, other treatments are often a better fit.
Look at your lower eyelids in a mirror, smiling and at rest. A flat lower lid with no bags and no tendency to morning puffiness may suit it. A bulge that gets bigger when you look up is more likely an eye bag. An assessment, with ultrasound if you have had under-eye filler before, gives the real answer.
References
Topographic Anatomy of the Inferior Medial Palpebral Artery and Its Relevance to the Pretarsal Roll Augmentation. Plastic and Reconstructive Surgery, 2016. source
Anatomy-Based Filler Injection: Treatment Techniques for Supraorbital Hollowness and Charming Roll. Life (Basel), 2025. source
Defining Ideal Pretarsal Rolls Through a Morphometric Analysis in Asians. Aesthetic Surgery Journal, 2024. source
Delayed Complications following Dermal Filler for Tear Trough Augmentation: A Systematic Review. Facial Plastic Surgery, 2022. source
Tear trough filler using the three-point tangent technique: lessons from 1452 tear trough applications. Plastic and Reconstructive Surgery Global Open, 2023. source
Avoiding malar edema during midface/cheek augmentation with dermal fillers. Journal of Clinical and Aesthetic Dermatology, 2011. source
Management of injected hyaluronic acid induced Tyndall effects. Lasers in Surgery and Medicine, 2006. source
The tear trough ligament: anatomical basis for the tear trough deformity. Plastic and Reconstructive Surgery, 2012. source
About this page: written and medically reviewed by Dr Sin Yong, MBBS (NUS), MRCS (Edinburgh) · Last reviewed 25 October 2026 · Illustrative images only, not patients · Editorial policy
Not for emergencies. A change in vision or eye pain after filler: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: go now to the doctor who injected you, or to A&E. Do not message or book for these signs.
