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 hot, red, painful lump, fever, vision change or skin colour change needs prompt review
Urgent — do not waitVision change or eye pain after filler: go to an emergency department or call 995 immediately, and contact the injecting doctor. Skin that turns pale, dusky or mottled, or pain that is getting worse: urgent assessment now; do not wait. These can be signs of filler in a blood vessel. A lump that is hot, red and tender, with or without fever, also needs prompt review.
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.
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 steroid 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.
How Dr Sin Yong assesses it
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 hyaluronic acid is confirmed 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 is managed differently, as set out on lumps after collagen stimulators.
Frequently Asked Questions
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, but a hot, red, painful lump, fever, or any change in vision or skin colour needs prompt review. 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.
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
