Lumps months or years after filler: delayed-onset nodules explained
Medically reviewed by Dr Sin Yong · Last reviewed · 6 min read
Published 9 October 2026 · Reviewed by Dr Sin Yong
A lump that appears long after filler, sometimes after an infection, a dental procedure or a vaccination elsewhere in the body, is different from a lump in the first few weeks. It is usually called a delayed-onset nodule. That name describes when it appeared, not what it is, and the cause decides the treatment.
Short answerA delayed-onset nodule is a lump appearing weeks to years after filler. It may be an inflammatory reaction, a low-grade infection on the filler surface (biofilm), a foreign-body granuloma, or filler that has migrated or swollen. A 2021 review argued it is a symptom rather than a diagnosis and should be investigated, with ultrasound and sometimes tests, before treatment.
Inflammatory reaction, biofilm, foreign-body granuloma, migrated or swollen filler
Key point
A symptom, not a diagnosis (Convery 2021)
First step
History, examination and ultrasound; tests where needed
Urgent
A change in vision or eye pain after filler: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: urgent assessment by the doctor who injected you, or at A&E, now. 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
Urgent — do not waitVision change or eye pain after filler: call 995 now. Skin that turns pale, dusky or mottled, or pain that is getting worse: urgent assessment by the doctor who injected you, or at A&E, now; do not wait. These can be signs of filler in a blood vessel. A lump that is hot, red and tender, or a fever, needs a doctor the same day; if no doctor can see you today, go to A&E.
LookalikesOften confused with an early lump or a simple bruise: a delayed nodule appears weeks to years after filler, sometimes after an infection or dental work, and a hot, red, tender one needs a doctor the same day (A&E if no doctor can see you today) rather than more filler. filler nodule.
Why does filler cause a lump years later?
Several different things produce the same complaint. The body’s immune system can react to filler long after it was placed, sometimes triggered by an infection or another immune challenge elsewhere. Bacteria can sit in a thin film on the surface of the filler, a biofilm, and flare later. Some people form a foreign-body granuloma around the material. And filler that has persisted for years can swell or migrate: hyaluronic acid has been found on MRI years after injection (Master, PRS Global Open 2024), and periocular filler has been documented causing new swelling up to nine years later (Chang, Ophthalmic Plast Reconstr Surg 2017).
The name ‘delayed nodule’ tells you when it appeared, not what it is.Illustrative image — not a patient.
Why it needs a diagnosis first
A 2021 review argued that a delayed-onset nodule is a symptom rather than a diagnosis, and recommended investigations such as ultrasound, inflammatory markers and sometimes histology instead of a sequence of guessed treatments (Convery, J Clin Aesthet Dermatol 2021). Consensus papers set out management by cause and timing (Signorini, Plast Reconstr Surg 2016; Urdiales-Gálvez, Aesthetic Plast Surg 2018). Injecting medicines into a lump that turns out to be infected, or massaging a granuloma, can make matters worse.
History, examination and ultrasound come before any treatment of a late lump.
What a late filler lump can be: cause, what it looks like, and what is done first
A delayed-onset nodule is a symptom with several possible causes, and the first step differs for each. The table sets out the pattern that points to each cause, what Dr Sin Yong does first, and what is not done until the cause is known.
A lump that appears long after filler tells you when it arrived, not what it is. I will not inject anything into it until the scan has answered that.— Dr Sin Yong
Likely cause
When it tends to appear
What it looks and feels like
What is done first
What is not done
Inflammatory or immune reaction
Later, often after an infection, dental work or a vaccination elsewhere
Swollen, sometimes tender, may affect several injected sites
A doctor the same day if it is red, hot, painful or swollen (A&E if no doctor can see you today); history, examination, ultrasound; inflammatory markers where useful
Hyaluronidase or other medicines injected before infection has been excluded
Biofilm (low-grade infection on the filler surface)
Later, sometimes flaring after a trigger
Firm, tender, can be warm or red; may come and go
A doctor the same day (A&E if no doctor can see you today); infection treated before anything else
Massage or an injected medical treatment alone
Foreign-body granuloma
Later, with any filler type
Firm, usually non-tender, slow to change
Ultrasound to show the likely material and depth; sometimes histology
Repeated guessed injections without a diagnosis
Migrated or swollen old filler
Later, sometimes long after injection
Soft, constant fullness or a defined edge
Ultrasound to show the pocket; targeted hyaluronidase after a skin test, if the lump is the hyaluronic acid itself
Adding more filler on top of what is already there
Non-hyaluronic-acid material
Any time after Sculptra, Radiesse, Ellansé or Juvelook
Firm nodule; hyaluronidase has no effect
Ultrasound mapping, then the Sculpting mode of Time Freeze Laser LCLR®, without an incision
He takes the history: which product, when, whether there have been top-ups, and what happened in the weeks before the lump appeared. He examines it for heat, tenderness and fluctuance, then uses ultrasound to see what the material looks like, how deep it sits and whether there is fluid or inflammation around it. Where the scan shows hyaluronic acid and infection is not suspected, targeted hyaluronidase may be part of the plan; where infection or a granuloma is suspected, the order of treatment changes. Non-HA material cannot be dissolved; Dr Sin Yong treats it with the Sculpting mode of Time Freeze Laser LCLR®, without an incision, as set out on lumps after collagen stimulators.
Your next step
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 as a Key Opinion Leader for CLASSYS, DEKA, HIRONIC, FOTONA, ALMA, LUTRONIC and ILOODA · HSA-registered devices · ultrasound-guided correction
It may be an inflammatory reaction, a low-grade infection on the filler surface, a granuloma, or old filler that has swollen or moved. Hyaluronic acid has been seen on MRI years after injection. An assessment, often with ultrasound, finds the cause.
Most are not dangerous. A change in vision or eye pain after filler: call 995 now. Pale, dusky or mottled skin, or pain that is getting worse: urgent assessment by the doctor who injected you, or at A&E, now. 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. Others still need a diagnosis before treatment.
If it is hyaluronic acid and infection is not suspected, targeted hyaluronidase may help. Infection, granulomas and non-HA fillers need a different order of treatment; Dr Sin Yong treats granulomas and non-HA filler with the Sculpting mode of Time Freeze Laser LCLR®, without an incision.
References
Convery C, Davies E, Murray G, Walker L. Delayed-onset nodules (DONs) and considering their treatment following use of hyaluronic acid fillers. J Clin Aesthet Dermatol. 2021;14(7):E59-E67. PMID 34840652. source
Signorini M, Liew S, Sundaram H, et al. Global Aesthetics Consensus: avoidance and management of complications from hyaluronic acid fillers. Plast Reconstr Surg. 2016;137(6):961e-971e. doi:10.1097/PRS.0000000000002184. source
Snozzi P, van Loghem JAJ. Complication management following rejuvenation procedures with hyaluronic acid fillers — an algorithm-based approach. Plast Reconstr Surg Glob Open. 2018;6:e2061. doi:10.1097/GOX.0000000000002061. source
Master M, Azizeddin A, Master V. Hyaluronic acid filler longevity in the mid-face: a review of 33 magnetic resonance imaging studies. Plast Reconstr Surg Glob Open. 2024;12(7):e5934. doi:10.1097/GOX.0000000000005934. source
Chang JR, Baharestani S, Salek SS, et al. Delayed superficial migration of retained hyaluronic acid years following periocular injection. Ophthalmic Plast Reconstr Surg. 2017;33(3S):S116-S118. doi:10.1097/IOP.0000000000000434. source
Lemperle G, Gauthier-Hazan N. Foreign body granulomas after all injectable dermal fillers: part 2. Treatment options. Plast Reconstr Surg. 2009;123(6):1864-1873. doi:10.1097/PRS.0b013e3181858f4f. source
