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Delayed Nodules After Under-Eye Filler —
When, Not What

Atelier Aesthetics · Medical Director: Dr. Sin Yong · Updated 23 Oct 2026

A delayed-onset nodule is a lump that appears weeks to years after filler, and its name says when it arrived rather than what it is. This page sets out the usual causes under the eye, how Dr Sin Yong works out which one it is at Atelier, and why the order of treatment depends on the answer.

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The Mechanism

A Name For Timing, Not Cause

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An early lump after filler usually reflects placement or swelling. A lump that arrives weeks, months or even years later is different, and it is often called a delayed-onset nodule. Sometimes it comes on after an infection, a dental procedure or a vaccination.

A 2021 paper argued that the term describes a symptom, not a diagnosis. The same firm lump under the eye can have quite different causes, and a step that helps one can make another worse.

Factor One
A Late Immune Response
Your immune system can turn on filler that has sat quietly for a long time, sometimes prompted by an infection or other immune trigger somewhere else in the body.
Factor Two
Bacteria In A Surface Film
Bacteria can sit quietly in a thin film on the filler surface, known as a biofilm, and flare later as a low-grade infection.
Factor Three
A Reaction To The Material
In some people the body walls off the injected material in a foreign-body granuloma. This can happen with any type of filler.
Factor Four
Filler That Lasts
MRI studies have found hyaluronic acid still present years after injection, and filler around the eye has caused new swelling up to nine years later. Old product can swell or move.

Types

Four Lumps With One Name

How the lump feels, and how it behaves over time, points towards the cause. These patterns are a guide rather than a diagnosis, which is why history and examination come before treatment. Hard lumps from non-HA fillers have their own page, and the other under-eye problems are sorted on under-eye filler lumps.

Specifications

Region
Tear trough and lower eyelid; sometimes several injected sites at once
Assessment
History of product, dates and any recent illness, dental work or vaccination; examination for heat, tenderness and fluctuance; tests where needed
Modalities
Infection treated first; hyaluronidase only for confirmed hyaluronic acid with no sign of infection
Review
Treatment and its order set once the cause is clear
Type I
Inflammatory Reaction
Swollen and sometimes tender, and it may involve several injected sites. Often comes after an infection, a dental procedure or a vaccination. Hyaluronidase and steroid wait until infection has been excluded.
Type II
Biofilm
Firm and tender, sometimes warm or red, and it may come and go, flaring after a trigger. The infection is treated before anything else; massage or steroid alone is avoided.
Type III
Granuloma
Firm, usually not tender and slow to change. It needs confirming, sometimes with a tissue sample, rather than a run of guessed injections.
Type IV
Old Filler, Swollen Or Moved
A soft, constant fullness or a defined edge, sometimes long after injection. If it is confirmed as hyaluronic acid, targeted hyaluronidase may be used; more filler on top is avoided.

The Decision

Diagnosis Before Any Needle

At Atelier, Dr SY starts with the history: which product was used, when it went in, whether there were top-ups, and anything that happened in the few weeks beforehand. A recent infection, dental treatment or vaccination is worth mentioning, even if it seems unrelated. The lump is then examined for heat, tenderness and fluctuance, with tests where they are needed.

Published guidance supports this order. The 2021 paper recommends investigating a delayed nodule, with imaging, inflammatory markers and sometimes histology, rather than working through a series of guessed treatments. Consensus papers organise treatment around the cause and the timing.

When hyaluronidase fits. If the lump proves to be hyaluronic acid and nothing points to infection, Dr SY may use targeted hyaluronidase, staged as described on filler correction. Old product that has spread tends to show the patterns on filler migration signs.

When the order changes. If infection or a granuloma is suspected, dissolving is not the first step. Steroid injected into an infected lump, or massage of a granuloma, can make matters worse. A lump of non-HA material does not respond to hyaluronidase at all.

What is not done. More filler is not added to disguise a nodule. If under-eye filler is considered again later, that is a separate decision, made on tear trough candidacy once the area has settled.

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Safety

Warning signs: when to get help now

Most delayed nodules are not dangerous, but they still need a diagnosis. These signs should not wait.

  1. Any change in vision, or eye pain, after filler: call 995 or go to an emergency department immediately, then contact the doctor who injected you. Go directly: do not travel to the clinic first, and do not drive yourself.
  2. Pale, dusky or mottled skin, or pain that is getting steadily worse: get an urgent assessment now; do not wait. Contact the clinic that injected you straight away; if you cannot reach it, go to A&E. Filler inside a blood vessel can cause these signs. See vascular occlusion warning signs.
  3. A hot, red, tender or painful lump, or a fever: this needs prompt review by a doctor. Do not massage it, and do not accept a steroid injection into it before infection has been excluded.
  4. A firm lump that is not hot or tender: not an emergency, but book an assessment rather than waiting for it to go.

FAQ

Delayed Nodules — Common Questions

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They can be. A late immune reaction to filler is recognised, and an infection, a dental procedure or a vaccination somewhere else in the body can prompt it, sometimes long after the filler was placed. Mention any recent illness or procedure at your assessment. It helps Dr SY judge whether the lump is an inflammatory reaction, which changes what is done first and what is avoided.
Because the cause has to be known first. If the lump is a low-grade infection, steroid on its own can make it worse, and an inflammatory reaction is not given steroid or hyaluronidase until infection has been excluded. Once the cause is clear, the treatment and its order follow from it. A steroid injection is not the first step for an unexplained late lump.
Only in some cases. If the lump is shown to be hyaluronic acid and there is no sign of infection, targeted hyaluronidase can be used. If infection or a granuloma is suspected, the order of treatment changes. Hyaluronidase has no effect on PLLA, CaHA, PCL or PDLLA, so lumps of these materials are managed according to the material.
A lump that comes and goes, especially one that is firm, tender and sometimes warm or red, can suggest a biofilm: bacteria living in a thin film on the filler surface that flare after a trigger. The infection is treated before anything else, and massage or steroid on their own are avoided. A lump like this should be seen promptly, not filled over.
Yes. An inflammatory or immune reaction may affect several of the sites that were injected, not only the under-eye area, and it often follows an infection, dental work or a vaccination. Tell Dr SY about every area that has had filler, and when, because a pattern across sites helps point to the cause.
That depends on the history and examination. The 2021 paper that described a delayed nodule as a symptom rather than a diagnosis recommends investigating it, with imaging, blood markers of inflammation and sometimes a tissue sample (histology), instead of trying one treatment after another. At Atelier, Dr SY explains which tests, if any, your case needs, why, and where they would be done, before any treatment.

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Related at Atelier

Related
Filler Correction
How hyaluronic acid is dissolved in stages, once it is confirmed as the cause.
Related
Tear Trough
Under-eye filler at Atelier: candidacy first, low volumes, a deep plane.
Related
Filler Migration Signs
When old product has spread rather than reacted: the signs to look for.

References

  1. Convery C, et al. J Clin Aesthet Dermatol. 2021;14(7):E59–E67: delayed-onset nodules (DONs) after hyaluronic acid filler, and their treatment.
  2. Signorini M, Liew S, Sundaram H, et al. Global Aesthetics Consensus… Plast Reconstr Surg. 2016;137(6):961e-971e.
  3. Urdiales-Gálvez F, Delgado NE, Figueiredo V, et al. Aesthetic Plast Surg. 2018;42(2):498-510.
  4. Master M, Azizeddin A, Master V. Plast Reconstr Surg Glob Open. 2024;12(7):e5934.
  5. Chang JR, Baharestani S, Salek SS, et al. Ophthalmic Plast Reconstr Surg. 2017;33(3S):S116-S118.
  6. Lemperle G, Gauthier-Hazan N. Plast Reconstr Surg. 2009;123(6):1864-1873.
  7. Ministry of Health, Singapore
  8. HealthHub, Singapore — public health information

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