infraorbital

Under-eye removal is described apart from the rest of the face for one reason. Every other region allows some margin. A millimetre of over-dissection in a cheek is usually invisible. Under the eye there is no margin. The skin is thin enough to show whatever lies beneath it, the structures that must be preserved are stacked within a few millimetres of each other, and the two ways of getting it wrong, leaving too much and taking too much, are both visible from across a room.

01What lies under the skin of the lower eyelid

The lower eyelid is built in layers, and each of them bears on this operation.

Skin: The thinnest skin on the face, with almost no subcutaneous fat beneath it close to the lid margin. Material placed under it shows through as a shadow, a ridge or a bluish tint.
Orbicularis oculi: The sphincter muscle that closes the eye. It also supports the lid margin. Material can sit in front of it, within it, or behind it, and the plane it occupies changes the approach entirely.
Orbital septum: A fibrous sheet running from the orbital rim to the tarsus. It is the wall holding orbital fat inside the orbit. Once it has been opened or weakened it does not return to what it was.
Orbital fat: Fat belonging to the orbit, in three compartments, held back by the septum. It is not the same tissue as the fat in front of the septum, and removing it has different consequences.
Tear trough ligament: A retaining structure along the lower orbital rim, binding skin to bone. The groove people call the tear trough follows its line. Filler placed above it, below it or across it behaves differently in each case.
Infraorbital nerve: It emerges from the infraorbital foramen below the rim and supplies sensation to the lower lid, the cheek, the side of the nose and the upper lip. Old material in the deep midface can lie directly on it.

These are not separate regions. They are stacked within a few millimetres of one another, and material injected years ago may cross more than one of them without any of it being apparent from outside.

Skin, orbicularis, orbital septum, orbital fat and the tear trough ligament along the rim. Injected material may lie in front of the muscle, within it, or deep to it.

02Why long-standing tear trough filler behaves as it does

Hyaluronic acid under the eye does not behave the way the same material behaves in a cheek. Three things are seen repeatedly, and they are worth separating, because they call for different answers.

It moves

Filler placed under the eye sits in a region that moves several thousand times a day, on planes that are relatively free. Over months and years material can migrate along those planes: downward onto the cheek, laterally toward the rim, or superficially toward the skin. It is not unusual to find on ultrasound that the material is no longer where it was injected, and that the visible bulge and the material are not in the same place. Injecting more into the bulge, in that situation, adds to a problem that is already one of position rather than quantity.

It holds water

Hyaluronic acid is hydrophilic. It binds water, which is the basis of its effect and also the basis of a complaint people find difficult to describe: the under-eye is puffier in the morning, or after salt, or after a poor night, and it has been that way for years. In a region with almost no soft tissue to absorb the change, a small volume of retained water is visible. This swelling is not in itself a sign of continuing inflammation. It is the material doing what it was made to do, in a place that does not tolerate it.

It shows through

Material placed too superficially under thin skin scatters light. Shorter wavelengths scatter more, so the area reads as bluish or grey rather than as a flesh-coloured ridge. This is the Tyndall effect. It is a physical consequence of a gel sitting shallow beneath a translucent surface, and it does not improve with time, because nothing about the position is changing.

All three can be present in the same eyelid, and often are. Someone who has had filler under both eyes across several years may have material that has migrated onto one cheek, holds water on both sides, and shows through the skin on one.

03Material other than hyaluronic acid

Hyaluronic acid is the common case, not the only one. The clinic lists industrial-grade foreign material, permanent filler, semi-permanent filler, hyaluronic acid filler and grafted fat among what it sees in this region. Hyaluronidase acts on the fourth of those and on none of the others.

Semi-permanent products are treated more cautiously here than elsewhere on the face. Where collagen forms more abundantly than intended around a collagen-stimulating material, a firm mass can develop with a foreign body reaction inside it. The clinic describes multinucleated giant cells on pathology after removal of such filler. In a cheek that is a lump. Under the eye it is a lump beneath skin that conceals nothing, adjacent to structures that will not tolerate a wide dissection to reach it.

04Assessment

Ultrasound is used before any decision is taken. It shows where the material actually lies, how deep it sits, how far it extends, and whether it has formed discrete encapsulated nodules. The purpose is practical. The less dissection needed to reach the material, the less the eyelid is disturbed, and the map is what keeps the dissection small.

It has limits here as elsewhere. Old mixtures and encapsulated material may not be delineated in full by ultrasound alone, and the extent found during surgery can differ from the extent predicted before it.

Under-eye fat and under-eye foreign material cannot be told apart reliably by looking and feeling. A bulge under the eye may be prolapsed orbital fat, it may be injected material, and it may be both at once. They are managed differently, and the distinction is made on examination together with ultrasound rather than from the outside.

Ultrasound before the operation. What it is asked for is position, depth, extent and whether the material has encapsulated.

05The approaches

The clinic describes removal by two routes: without an incision, and with one. The incisional route divides again into an approach through the conjunctiva and an approach through the skin.

Approaches, as the clinic describes them

Approach	Chosen when	What it does not address
Without incision	The material is soft, has not encapsulated, lies close to the eye, and no correction of skin laxity is needed. A cannula is passed through a small entry point.	Encapsulated material. A capsule is not drawn out through a cannula, and what stays behind can produce the same symptom again.
Transconjunctival	The material lies close to the eye, the skin does not need tightening, and the lid is well supported. The incision is on the inner surface of the lid, so no skin is cut.	Loose skin. Nothing is tightened by this route, and material lying further from the eye is difficult to reach through it.
Transcutaneous	The material is hard or encapsulated, lies further from the eye, in the anterior cheek, over the zygoma or along the tear trough, or skin laxity needs correcting at the same time.	It requires an external incision and a wider dissection, with the exposure to lid position that follows from both.

The two incisional routes are sometimes planned together. The final choice is made on examination, and it can change during the operation if the material proves to extend further than the imaging suggested.

Why the non-incisional route is not always sufficient is worth stating plainly. Material that has organised itself into capsules, large and small, does not leave the capsule through a cannula. What comes out is the soft part; the capsule stays. A lump that feels smaller immediately afterwards has not necessarily been removed, and the clinic asks for such cases to be followed, because material left in place can produce the same problem again.

06What must be preserved, and why the limit is lower here

The principle is the same as everywhere else on the face. Normal tissue is preserved, so removal is not complete. What differs under the eye is how narrow the acceptable band is at both ends.

Leave too much and it is visible, because the skin above it hides nothing. Take too much and the consequence is structural rather than cosmetic. Dissection that damages the orbicularis, or weakens the support of the lid margin, can leave the lid unable to hold its position. It can retract, showing white below the iris. It can turn outward. The eye can water, or become dry and irritated because the lid no longer closes over it properly. Fat taken from the wrong compartment leaves a hollow that is harder to correct than the bulge that preceded it.

Under the eye, the amount left behind decides the result as much as the amount that comes out.
The clinic’s stated operating principle

The infraorbital nerve sets the other fixed limit. Material lying on it is reduced rather than pursued, because separating it completely risks numbness of the lid, cheek, side of the nose and upper lip that may not fully recover.

For the same reason, assessment and operation are treated as one continuous judgement rather than two steps. The plan made on ultrasound is revised against what the tissue shows once the plane is open, and the revision is usually in the direction of taking less.

Materials seen: Industrial-grade foreign material, permanent filler, semi-permanent filler, hyaluronic acid filler, grafted fat
Approaches: Without incision; with incision, transconjunctival or transcutaneous
Assessment: Examination with ultrasound; histology where a foreign body reaction needs confirming
Anaesthesia: Sedation
Operating time: 90 to 120 minutes
Sutures removed: 5 to 7 days
Main recovery: About one week
Follow-up before the result is judged: At least six months
Surgeon: The clinic states that under-eye foreign body removal is carried out by Dr. Chang Min Kang. Assignment follows clinic policy and is confirmed at consultation.

07Recovery

Swelling under the eye does not peak immediately. It increases over the first day or two, is usually worst on the second day, and then settles. Where the skin approach has been used, sutures come out at five to seven days. Most people return to ordinary activity from about a week.

Bruising in this region is conspicuous and lasts longer than people expect, because the skin conceals nothing. The slower element, again, is the tissue. Scar forms where material has been separated from the eyelid, and scar is firm before it is soft. The surface can feel or look slightly uneven during that period. The clinic asks for a minimum of six months of follow-up before the result is judged, and before any decision about further removal is taken.

Judging the result at three weeks is judging swelling. That is difficult advice to follow in a region the patient examines every morning. It is given anyway.

08When this is not the right operation

Where the skin does not need tightening and the material is soft and close to the eye, an external incision may be unnecessary. The transconjunctival or non-incisional route is enough.
Where the material has encapsulated, the non-incisional route is likely to leave material behind, and an incisional approach is the more predictable choice.
Where inflammation is active, it is settled with medication first and the timing of removal is decided after that.
Where a reaction to a semi-permanent filler needs confirming, histology is planned alongside the removal rather than considered after it.
Where the material extends well beyond the lower lid into the midface, the plan is made for the whole region rather than for the eyelid alone.

Material under the eye is frequently part of something wider, with filler or grafted fat in the cheek and midface as well. The assessment covers the whole region, and the general principles set out under facial foreign body removal apply here too, with a narrower margin.

No. Normal tissue is preserved, so complete removal is not the aim. Under the eye the amount left behind matters more than it does elsewhere, because thin skin shows it, so the work is directed at reducing what produces the symptom as far as the surrounding structures safely allow.

It increases over the first day or two and is usually worst on the second day. Bruising is conspicuous here and can last longer than in other regions. Scar tissue can leave the surface feeling firm or slightly uneven for some months, and settling takes longer than after most other operations.

Not necessarily. What can be felt immediately afterwards may be reduced while encapsulated material remains in place. Where material remains, the same symptom can return, so the area is followed rather than signed off.

Usually not. Prolapsed orbital fat and injected material can look and feel similar from outside, and both can be present at once. The distinction is made on examination with ultrasound.

They are designed to provoke collagen. Where more collagen forms than was intended, a foreign body reaction can develop around the material, and the clinic describes multinucleated giant cells on pathology in such cases. Under thin eyelid skin a firm mass of that kind is both visible and awkward to reach, so the removal is planned with the pathology in mind and, where useful, confirmed by it.

ReferencesUVOM Plastic Surgery, procedure information for under-eye foreign body removal.The clinic’s own description of the materials it sees, its two removal approaches, its operative information and the surgeon assigned to the operation. It is the clinic’s stated protocol, not peer-reviewed evidence.Kang CM, Shim JS, Park SH, Jeong YJ, Seol KH, Kwak SG. Volume Change of Muscle and Fat Portions of Latissimus Dorsi Myocutaneous Flap after Breast Reconstruction. Plast Reconstr Surg Glob Open. 2021;9(4):e3536.PMID 33868878Sixteen patients after breast reconstruction. Muscle and fat were measured as separate components. Cited only as background to the practice of separating tissue by layer and by component. It is not evidence about eyelid surgery.ContinueRemovalFacial Foreign Body RemovalMaterial injected into a face does not always answer to an injection that dissolves it. This page sets out how the…RemovalKnowing What Is In ThereMost people arrive without a product name, a receipt or a record. Identification begins instead with what can still…RemovalHow Much Comes OutOpening is not the difficult part of a removal. The difficult part is deciding, against the anatomy actually in…