Could under-eye filler injected years ago still remain?
“Could under-eye filler still remain even several years after treatment?”
Yes, filler injected under the eyes long ago may still remain within the tissues.
Although hyaluronic acid filler breaks down in the body over time, the end of the duration of cosmetic correction demonstrated in clinical trials does not necessarily mean the filler material has completely disappeared from the tissues.
However, under-eye bulging or puffiness is not always caused by residual filler.
Residual filler, surrounding edema or inflammatory reactions, uneven distribution, preexisting protruding under-eye fat, tear troughs, and skin or muscle laxity can all create similar appearances.
When old under-eye filler is suspected, the first step is therefore to distinguish the actual cause of the current bulging rather than automatically dissolving or removing it.
Isn't all under-eye filler absorbed over time?
Hyaluronic acid filler can be broken down in the body. However, the point when its improvement in volume or contour diminishes does not necessarily coincide with complete disappearance of the material from the tissues.
Reports describe material suspected to be filler remaining on imaging even when its visible effect appears to have faded.
The following factors may affect filler persistence.
- The filler's physical properties and degree of cross-linking
- The amount injected in a single session
- Repeated treatment and cumulative injected volume
- The anatomical injection site and depth
- Tissue movement in the area
- Individual differences in tissue response and metabolism
- Edema or inflammatory reactions around the filler
An MRI study published in 2024 identified hyaluronic acid filler in all 33 patients treated in the midface 2 years or more after their last injection; persistence for up to 15 years was observed in some cases.
However, the study was not limited to the under-eye area, included few participants, and included some patients scanned because of edema. Persistence for up to 15 years was not observed in every participant.
The study does not mean that all under-eye fillers remain for 10 or 15 years. It suggests that hyaluronic acid filler may remain visible on imaging longer than the traditionally recognized duration of cosmetic effect.
Why can even a small amount of residual filler be noticeable under the eyes?
The under-eye area has thin skin and subcutaneous tissue, with closely situated structures including the orbicularis oculi muscle, orbital septum, and under-eye fat.
Even a small amount of residual filler or edema around it may therefore cause relatively visible changes.
Hyaluronic acid binds water. Filler volume and location, lymphatic drainage under the eyes, and individual tissue responses may together create a thickened or puffy appearance.
However, under-eye edema does not have the same cause in every patient. Allergies, rhinitis, sleeping position, salt intake, fatigue, and systemic disease can also cause swelling, so edema alone cannot establish residual filler.
What symptoms may occur if old under-eye filler remains?
Residual old filler does not necessarily cause symptoms.
Some people have no particular discomfort, and identification of filler on imaging alone does not constitute a complication.
However, the following changes warrant assessment of residual filler and surrounding tissue.
1. Persistent under-eye bulging
A raised border after filler treatment or increasing under-eye thickness over time warrants assessment for residual filler, previous overfilling, uneven distribution, or surrounding edema.
However, bulging may also result from forward protrusion of preexisting under-eye fat, making appearance alone insufficient to determine the cause.
2. Recurrent swelling beneath only one eye
Under-eye swelling that is worse in the morning and decreases later can also result from sleeping position, salt intake, allergies, or rhinitis.
However, if swelling began after filler treatment or repeatedly affects the same location beneath one eye, possible involvement of residual filler and surrounding tissue edema should be assessed.
3. A blue or gray appearance under the eyes
Filler close to the skin surface may scatter light and create a bluish or gray appearance known as the Tyndall effect.
However, visible vessels through thin skin, pigmentation, and tear-trough shadows can also cause dark circles, so skin color changes alone do not establish residual filler.
4. Under-eye unevenness when smiling
If a particular area bulges when smiling or making expressions but is less noticeable at rest, uneven filler distribution, protruding under-eye fat, or both should be assessed.
5. Firm nodules or pain
Rarely, delayed reactions such as edema, redness, warmth, tenderness, or firm nodules may develop months or years after hyaluronic acid filler treatment.
However, not every nodule is caused by the filler itself. Inflammatory nodules, infection, foreign-body reactions, and other mass lesions may need to be distinguished.
Redness, warmth, pain, or recurrent swelling warrants medical assessment rather than being treated as a purely cosmetic issue.
How can under-eye filler be distinguished from under-eye fat?
When bulging develops, residual filler must be distinguished from protrusion of the person's own under-eye fat.
Both can coexist, making a complete distinction difficult from photographs or appearance alone.
Clinical assessment considers the following information together.
- When filler was last injected
- Number of treatments and approximate injected volume
- Whether filler was also injected into the anterior cheeks
- Whether the product was hyaluronic acid filler
- Any previous hyaluronidase treatment
- When and under what circumstances swelling worsens
- Associated redness, warmth, or tenderness
- Firmness and mobility on palpation
- Changes in under-eye shape with facial expressions
- Coexisting protruding under-eye fat, tear troughs, or skin sagging
With protruding under-eye fat, the fat compartments below the eye often project forward with a tear trough or shadow beneath them. Residual filler or surrounding edema may instead thicken the junction between the under-eye area and anterior cheek, or create a shelf-like bulge.
These appearances alone do not establish a diagnosis. Treatment history, palpation, changes with expression, and imaging when needed should be assessed together.
Can ultrasound identify old filler?
High-frequency ultrasound may help assess the location and distribution of suspected filler or foreign material, as well as surrounding edema or nodules.
Ultrasound can help assess the following.
- Whether material suspected to be filler is present
- The tissue layer containing the material
- Whether it is localized or widely distributed
- Whether surrounding edema or nodules are present
- The treatment location if injections are needed
However, ultrasound cannot establish the precise product name or composition of every filler. Findings may vary with the injected material, treatment timing, injection site, equipment, and examiner experience.
Ultrasound should therefore complement previous treatment records and clinical examination findings.
MRI is not necessary for every patient. It may be considered selectively when examination and ultrasound do not clarify the cause, a lesion is suspected to be deep or widespread, or another condition needs to be distinguished.
Should old under-eye filler always be dissolved?
Automatically injecting hyaluronidase whenever old filler is suspected may be inappropriate. The first step is to establish whether the previously injected material was hyaluronic acid filler.
Hyaluronidase is an enzyme that breaks down hyaluronic acid.
A clinician may consider it for excessive or unevenly distributed residual hyaluronic acid filler, or suspected filler-related edema or nodules.
The response may vary with the following factors.
- Filler type and degree of cross-linking
- Injected filler volume
- The tissue layer containing the filler
- Whether the filler is localized or spread across several layers
- Repeated treatment
- Associated edema or inflammatory reactions
Long-standing filler or filler distributed across multiple layers may not decrease sufficiently after one session and may require staged treatment with reassessment.
Temporary swelling, bruising, or tenderness may occur after treatment, and preexisting tear troughs or under-eye hollowing previously concealed by filler may reappear.
Rare allergic reactions are also possible, so treatment should follow identification of filler type and location and a clinician's assessment.
Are there fillers that hyaluronidase cannot dissolve?
Hyaluronidase acts on hyaluronic acid filler. The same breakdown effect cannot be expected for non-hyaluronic acid materials such as the following.
- Liquid silicone
- Paraffin
- PMMA
- Polyacrylamide hydrogel
- Calcium hydroxylapatite
- Poly-L-lactic acid
- Other foreign materials of unknown composition
Materials such as poly-L-lactic acid stimulate collagen production in surrounding tissue and act differently from hyaluronic acid filler. All injectables should therefore not be treated as the same filler or managed in the same way.
If the injected material is unknown, it is important to assess its likely type and the tissue condition through records, examination, and imaging when needed, rather than repeatedly administering hyaluronidase without further evaluation.
If bulging persists after filler dissolution, does that mean filler remains?
Some filler may remain, but that is not the only possible cause.
Persistent under-eye bulging after dissolution may have the following explanations.
- Residual filler distributed across multiple tissue layers
- Reappearance of preexisting under-eye fat and tear troughs previously concealed by filler
- Persistent surrounding edema or inflammatory nodules in addition to residual filler
- Coexisting under-eye aging, including skin and orbicularis oculi laxity or orbital septum weakening
- The original injected material was not hyaluronic acid filler
Persistent bulging after hyaluronidase should therefore not automatically be taken to mean incomplete filler removal, nor should it immediately be assumed to require under-eye fat surgery.
Can old under-eye filler ever require surgical removal?
For hyaluronic acid filler, nonsurgical treatment with hyaluronidase is generally considered first.
Surgical removal is not the usual first step in hyaluronic acid filler treatment and is considered in limited situations that are difficult to resolve nonsurgically.
A surgical approach may be considered in the following situations.
- Suspected non-hyaluronic acid foreign material with persistent edema or deformity
- Confirmed or strongly suspected material that hyaluronidase cannot break down
- Firm nodules or granulomatous lesions
- Persistent pain, edema, or deformity despite repeated nonsurgical treatment
- Foreign material coexisting with protruding under-eye fat and sagging skin
- A mass that cannot be diagnosed adequately by examination and imaging and requires histological confirmation
Even when surgery is necessary, the choice between removal alone and combined under-eye fat repositioning or lower eyelid correction varies by patient.
The under-eye area has thin skin and closely situated important structures, including the orbicularis oculi muscle, orbital septum, and under-eye fat.
When injected material is dispersed among normal tissues or difficult to distinguish from them, attempting complete removal can damage normal tissue.
The surgical goal is therefore to remove symptom-causing and deforming material as far as feasible while preserving normal tissue and restoring stable under-eye structures, rather than removing every trace regardless of the consequences.
Must old filler always be removed if it remains?
No. Even if old filler remains, removal is not necessarily required when there are no cosmetic concerns or symptoms such as edema, pain, inflammation, or nodules.
Identification of filler on imaging alone does not imply disease or a complication. Treatment should not be determined solely by its presence,
but by current symptoms, visible deformity, and surrounding tissue condition.
Medical assessment is advisable in the following situations.
- Increasing under-eye bulging
- Persistent swelling beneath only one eye
- Recurrent edema at the same location
- A blue or gray appearance under the eyes
- A palpable firm lump
- Associated redness, warmth, or tenderness
- Persistent edema and deformity after hyaluronidase
- An unknown previously injected material
Regardless of previous filler treatment, sudden loss of vision, severe eye pain, double vision, or rapid skin color changes require immediate ophthalmic or emergency medical care rather than self-diagnosis as a residual filler problem.
Frequently asked questions
Q. Can under-eye filler remain for 10 years or more?
A. It is possible. A midface MRI study reported cases in which hyaluronic acid filler was visible up to 15 years later.
However, the study was not limited to the under-eye area and had few participants, so it cannot establish that all under-eye fillers remain for 10 years or more.
Q. Can I tell whether filler remains by touching the area?
A. Filler near the skin surface or concentrated in one area may be palpable, but filler distributed widely in deeper layers may be difficult to identify by touch alone.
High-frequency ultrasound may help with diagnosis when needed.
Q. Can ultrasound identify the exact filler type?
A. Ultrasound helps locate suspected filler or foreign material and assess its distribution, but it cannot establish the product name or composition of every filler.
Previous treatment records and examination findings should be assessed together.
Q. Can all old under-eye filler be dissolved in one session?
A. This depends on the filler type, amount, location, distribution, and treatment history. Long-standing filler or filler spread across multiple layers may require staged treatment.
Q. Will dissolving filler immediately restore my original under-eye appearance?
A. Not always. The original tear trough or protruding under-eye fat may become visible again after filler decreases, and residual edema or inflammatory nodules may prevent immediate restoration of the contour.
Q. Must old filler always be removed if it remains?
A. Removal is not necessarily required when there are no symptoms or cosmetic concerns. Treatment should depend on problems such as edema, nodules, inflammation, pain, or asymmetry rather than the mere presence of filler.
Old under-eye filler: accurate diagnosis comes before removal
Filler injected under the eyes long ago may remain. However, bulging and puffiness alone do not establish residual filler as the cause.
Residual filler, surrounding edema or inflammatory reactions, uneven distribution, preexisting protruding fat, tear troughs, and skin or muscle laxity may occur individually or together.
When old under-eye filler is suspected, three points should be assessed first.
- What material was previously injected and where
- Which tissue layers currently contain filler or foreign material and how it is distributed
- Whether protruding under-eye fat, edema, nodules, or sagging skin coexist
These findings should guide the choice of observation, hyaluronidase, limited surgical removal, or correction of under-eye structures.
The key is not simply establishing whether old filler remains, but identifying the actual cause of the current bulging and selecting treatment appropriate to that cause.
If you are concerned about residual under-eye filler, contact us at 02-545-3700 or through “UVOM Plastic Surgery” on KakaoTalk.
For more articles on under-eye foreign-body removal, select a title below ▼
How can under-eye foreign material be distinguished from under-eye fat?
Can under-eye foreign-body removal and lower blepharoplasty be performed together?
Why do my under-eyes continue to look puffy after filler injections?