| Written by Dr. Yu Hyemi, Co-Director & Board-Certified Plastic Surgeon at Bio Plastic Surgery
Nodules following filler and skin booster treatments are a delayed complication — appearing not immediately after the procedure, but months or even years later. Without accurate diagnosis and treatment, symptoms can worsen over time.
"It gets more swollen when I'm tired. It pulls when I try to smile. Every morning before something important, I'm scared."
I am a board-certified plastic surgeon — and I have been through this myself. I received these treatments on my own face and developed nodules under my eyes and in my philtrum area. Going through the treatment process gave me a deeper empathy for my patients, and pushed me to develop more effective approaches.
So why do nodules form — and what can be done about them?
Why Skin Treatments Can Cause Nodules
Skin boosters are a broad category of injectable treatments designed to supply the dermis with hydration, collagen, and growth factors — improving skin elasticity and radiance.
- Hyaluronic acid (HA)-based: products such as Rejuran and Juvelook aim to hydrate and firm the skin. Since hyaluronic acid naturally exists in the body, these are considered relatively low-risk.
- PLLA (poly-L-lactic acid)-based: products such as Sculptra work by stimulating the body's own collagen production.
Juvelook in particular has gained significant attention recently. It induces mild inflammation to trigger collagen synthesis — but the degree of inflammatory response and collagen production varies from person to person, which is why unexpected complications can occur.
Granulomas and Nodules — Appearing Months to Years After Treatment
Nodules form when the body identifies injected filler or collagen as a foreign substance. In some cases, the immune system creates a protective barrier called a biofilm around the material — leading to two possible outcomes: granulomas and nodules.
When excessive inflammation occurs at the injection site, a granuloma can develop — a larger, visible lump. A study published in the Journal of the Korean Society of Radiology (Kim et al., 2017), which analyzed 50 filler complication patients via ultrasound, states:
“Granulomas are late complications that develop several months to years after injection. The exact cause remains unknown; several theories include immunological cross-reactions, delayed immune stimulation, and cross-contamination via the injection pathway."
A nodule forms when filler or injectables are placed incorrectly, or accumulate around facial muscles — such as those around the mouth. Nodules feel firm and distinct to the touch. Depending on their location, they may or may not be visible, though nodules on the neck, hands, or forehead tend to be easier to observe.
Ultrasound Is the Only Way to Know for Sure
Not every hard or swollen area is a nodule. Whether it's a simple clump of filler, an inflammatory granuloma, or an infection-related complication determines the entire treatment approach — and only ultrasound can accurately make that distinction.
If you have any of the following symptoms, an ultrasound evaluation is recommended:
- The area swells more when you're tired or around your menstrual cycle
- You feel pulling or pain when smiling or frowning
- The lump appears to be growing
- It appeared for the first time months or years after your treatment
- It's tender to the touch
How to Reduce Your Risk of Nodules
Three things to keep in mind before your next treatment.
1. Spread it out — diluted, distributed evenly
Concentrating filler or Juvelook in a single area is not recommended. Muscles in that area — around the eyes, nasolabial folds — contract and compress the injection site, increasing the likelihood of nodule formation. Undiluted substances injected in concentrated amounts are particularly high-risk.
2. Know your immune history — especially with autoimmune conditions
People with autoimmune conditions — where the immune system is overactivated — are more prone to biofilm formation, the primary mechanism behind nodule development. This includes rheumatoid arthritis, psoriasis, and systemic lupus erythematosus (SLE). If you have any of these, PLLA or PDLLA-based skin boosters are best avoided. The same applies if you have a prior history of nodules.
3. Consider your vaccine history
Not sure about your immune reactivity? Think back — have you ever experienced swelling or pain after a vaccine? If so, skin boosters that trigger an immune response are generally not advisable. There are also documented cases of nodules appearing at a prior injection site following vaccination. Heavy alcohol consumption, sleep deprivation, or a high fever from the flu can similarly trigger delayed nodule formation.
Can Nodules Be Treated?
If you suspect a nodule and visit a clinic, the process typically looks like this:
1. Ultrasound diagnosis
The depth, nature, and tissue behavior of the nodule are assessed — including whether the muscle and dermal layers are gliding properly during facial expressions. When a nodule forms, these layers can adhere together, causing discomfort and unnatural movement when smiling.
2. Layer separation through treatment
The adhered layers are separated. This may involve ultrasound-guided hydrodissection — creating a pathway to release the tissue — as well as extracorporeal shockwave therapy. In some cases, the nodule itself may be surgically removed.
It's worth noting that nodules can also impair blood circulation in the area, leading to uneven skin tone, hyperpigmentation, and in some cases, dry eyes and reduced vision.
Treatment Options by Substance Type
- Hyaluronic acid-based → Intralesional hyaluronidase injection
- Inflammatory granuloma → Intralesional triamcinolone + 5-FU combination
- Suspected infection → Antibiotics first, then immunosuppressive approach
- Non-responsive cases → Surgical excision
- Unknown substance → Stepwise ultrasound-guided approach; consider biopsy
Most patients cannot recall exactly what product was used. This is why there is rarely a single cause — or a single solution.
Medically speaking, nodules are difficult to remove completely, even with surgery. This is even more true when the substance is unknown.
What Improves After Treatment
That said, the goal of treatment is not complete elimination — it's the restoration of comfort and daily function. Think of it the way you would a fracture: even if the bone doesn't return to its original state perfectly, successful treatment means the pain decreases and you can walk again.
Nodules are ultimately connected to the immune system. Treatment therefore goes beyond injections — it requires improving overall skin health and supporting immune function as a foundation for recovery.
Treatment Takes Time — Anywhere from 2 Weeks to 3 Months
Recovery is longer than most people expect. Depending on the type of nodule and the patient's condition, treatment can take anywhere from two weeks to three months. Because nodule formation is tied to the immune system, there is no fixed protocol — treatment must be tailored to the individual.
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I understand what it feels like to check that spot in the mirror every morning before something important. To want to smile but feel it pull. To notice it more on tired days. To feel like no one around you quite gets it.
Don't carry that worry alone. If you have these symptoms, start with an ultrasound evaluation. Knowing exactly what's there is the first step toward knowing how to treat it.
[FAQ]
Q1. How common are nodules after filler or Juvelook?
They don't develop in everyone — but the risk is higher in those with autoimmune conditions, a history of vaccine reactions, or treatments where product was concentrated in a single area.
Q2. I had no issues after my treatment, but a lump appeared a year later. Could it be a nodule?
Nodules can only be accurately assessed via ultrasound. A clinical visit for diagnosis is recommended.
Q3. Can nodules be completely removed with surgery?
Complete surgical removal is difficult. Granulomas often have ill-defined borders, making excision incomplete — and surgery can leave scarring. The treatment goal is reduction in swelling, restoration of natural expression, and relief from daily discomfort — not complete elimination.
Q4. How long does treatment take?
It varies depending on the individual's immune status and the type of nodule — anywhere from two weeks to three months. Treatment is not a single injection; it requires managing overall immune health alongside targeted intervention.
Q5. Which type of clinic should I go to?
A dermatology or plastic surgery clinic with ultrasound capability. The depth and nature of the nodule must be assessed via ultrasound before any treatment decisions are made. Clinics that begin treatment without ultrasound evaluation warrant caution.
| Written by Dr. Yu Hyemi, Co-Director & Board-Certified Plastic Surgeon at Bio Plastic Surgery
| Edited by Sia Shin, The Pylon Club
