Juvelook Volume nodules: why do they form and how should they be treated?

Juvelook Volume nodules are a side effect in which the PDLLA (Poly-D,L-lactic acid) particles injected under the eyes do not disperse evenly but clump together, forming a hard lump felt under the skin. The key to Juvelook Volume is that it is not a procedure that fills volume like hyaluronic acid fillers, but rather a collagen booster series that gradually decomposes to induce self-collagen production.

There is one important point to note. Unlike HA fillers, PDLLA particles cannot be dissolved with hyaluronidase (Hyalase). Therefore, once nodules occur, handling them becomes more difficult, and it is wiser to focus on prevention from the very beginning. Today, we will summarize why these nodules occur, especially under the eyes, and how to evaluate and cope with them from the perspective of Onlif Clinic.

🔍 What are Juvelook Volume Nodules?

PDLLA, the main ingredient of Juvelook, is a biodegradable polymer that slowly decomposes in the skin to stimulate collagen production. The particle size is designed to be approximately 25–50μm (micrometers), characterized by its miniaturization so that it can be used even on thin under-eye skin.

Nodules refer to lumps that are felt when these particles gather in one place, causing a fibrotic reaction, or when an individual's immune response occurs excessively. They vary in shape from tiny specks to noticeable lumps.

The under-eye area is particularly delicate. The skin under the eyes is one of the thinnest areas of the face, with a thickness of around 0.5 mm, so even tiny clumps can easily show through, and the risk of occurrence is relatively high.

📌 Key Summary: Juvelook Volume nodules are hard lumps caused by the clumping of PDLLA particles, making them particularly noticeable under the thin skin of the eyes.

⏱️ Swelling vs. Nodules: How to Tell the Difference

An uneven under-eye area immediately after the procedure is not necessarily a nodule. Swelling and temporary clumping within 2 weeks of injection are often part of the natural recovery process.

On the other hand, if a hard lump is felt and does not disappear even after 2 weeks, you should suspect a nodule. If redness, pain, or heat is accompanied, it may be an inflammatory nodule, requiring prompt medical attention.

Nodules are generally divided into three types.

Delayed-onset nodules can appear at a time when you might have forgotten about the treatment. It is helpful to know that in PDLLA-based procedures, delayed-onset nodules in the form of granulomas can occur even several months to over a year later.

📌 Key Summary: Clumping within 2 weeks is highly likely to be swelling, but a hard lump persisting for over 2 weeks is a sign of a nodule, and delayed-onset nodules can appear even months later.

🧩 Why Do Nodules Form? — Major Causes

The cause of nodules is usually a combination of several factors.

• Insufficient Dilution/Hydration: If the product is not sufficiently dissolved and mixed during preparation, the particles are prone to clumping.

• Excessive Injection: Injecting more than necessary into the thin under-eye area makes dispersion difficult.

• Too Shallow Injection Depth: There are reports showing that if the injection depth is shallower than 0.5 mm, the probability of nodule formation is about 2% to 5%.

• Individual Immune Response: Even under the same conditions, the degree of foreign body response varies from person to person.

• Biofilm: A state where bacteria form a protective film to develop antibiotic resistance, which can also cause delayed-onset inflammatory nodules.

For reference, the incidence rate of nodules in PLLA-based collagen boosters is widely reported from 6% to 44% depending on the study. However, it should be noted that this is a statistic for the general category, not a specific figure for Juvelook.

📌 Key Summary: Insufficient dilution, excessive injection, shallow depth, individual immune response, and biofilm are representative causes, making preparation processes and injection techniques crucial.

⚖️ Juvelook vs. Sculptra: What Is the Risk of Nodules?

Even within the same category of collagen boosters, the particle structure differs.

Juvelook is designed with spherical porous particles and is known to have a relatively lower risk of nodules compared to Sculptra. However, 'low' does not mean 'zero'. Under the thin under-eye skin, the skill of the practitioner greatly determines the outcome for any product.

This is also where the crucial difference from HA fillers lies. HA can be dissolved with hyaluronidase, but PDLLA particles themselves are not degraded by enzymes, which fundamentally changes the management strategy for nodules.

📌 Key Summary: Juvelook has a relatively low risk of nodules due to its spherical porous particles, but unlike HA, it cannot be dissolved by enzymes, making prevention and diagnosis more critical.

🩺 If Nodules Form — Diagnosis and Treatment

If a nodule is suspected, an accurate differential diagnosis must come first rather than self-diagnosis. Similar lesions unrelated to the procedure, such as milia and epidermoid cysts, can occur under the eyes, and the Tyndall effect, where the injectant looks blue due to shallow layer injection, is sometimes mistaken for a nodule.

In this case, high-frequency skin ultrasound is useful for checking the depth layer of the nodule, differentiating between liquid and fibrotic characteristics, and determining whether it overlaps with existing fillers. Knowing the nature of the nodule is key to setting the direction of treatment.

Treatment options are divided according to the situation as follows:

• Observation: Small, asymptomatic nodules may resolve on their own over time.

• Intralesional Steroid Injection: A representative non-surgical method used for hard, non-inflammatory nodules.

• Combined 5-FU Injection: Sometimes used alongside steroids to reduce the fibrotic reaction.

• Ultrasound-Guided Injection: Delivers medication to the precise location.

• Surgical Removal: Rarely considered when there is no response to the previous methods.

Onlif Clinic prioritizes non-surgical approaches from a dermatological perspective. Surgery is only a last resort, carefully reviewed when there is no response to various other methods; it is not the answer from the start. Please remember that the earlier it is discovered and properly managed, the wider your options will be.

One point to emphasize: Vascular occlusion is an emergency situation that can occur during treatment. If you experience signs such as skin paleness, severe pain, or vision abnormalities, you must seek medical attention immediately without delay.

📌 Key Summary: After differentiating the characteristics with ultrasound, non-surgical methods such as observation, steroid, 5-FU combination, and ultrasound-guided injection are prioritized, and immediate medical attention is required if emergency signals appear.

🛡️ Prevention Is Best — What to Check Before Treatment

Since it is an ingredient that does not dissolve with enzymes, it is best to prevent nodules before they form.

The key to prevention is simple: sufficient hydration, proper dilution, accurate injection depth, dispersing small amounts widely, and an experienced medical team that handles this process stably.

Before the procedure, history taking is also essential. If you have a history of lower blepharoplasty, HA fillers, fat grafting, or thread lifting, the tissue layers may not be even, which can increase the risk of nodules, so you must inform the practitioner in advance.

Checking the scope of MFDS approval and whether it is off-label is also a legitimate right of the consumer. Since dark circles are a mix of pigmentary, vascular, and structural causes, we do not recommend starting treatment without diagnosing the cause.

From the perspective of 'Because you are precious, we do not change you,' Onlif Clinic aims for natural, non-excessive improvement. Our doctor specialty system, where doctors focus on the treatments they excel at, also stems from this prudence.

📌 Key Summary: Hydration, dilution, depth, dispersed injection, experienced medical staff, and checking past medical history/indications are the keys to preventing nodules.

❌ What You Must Absolutely Avoid If Nodules Form

Lastly, a quick note: Attempting to press hard on the nodule with your hands or trying to dissolve it with massage is strictly prohibited.

Instead, the particles may be stimulated over a wider area, worsening the situation. If you suspect a nodule, seeking medical treatment should come first instead of self-treatment. Taking notes of changes in size, location, quantity, and previous history will help with the diagnosis.

📌 Key Summary: Do not press or massage, and the safest approach is to record the changes and seek medical attention immediately.

❓ Frequently Asked Questions (FAQ)

The area under my eyes is uneven after the Juvelook Volume procedure. Is it a nodule or swelling?

If it is within 2 weeks, it is highly likely to be swelling or temporary clumping. However, if it still feels hard after 2 weeks, it is recommended to suspect a nodule and seek medical evaluation.

Can Juvelook Volume nodules be dissolved with hyaluronidase?

No. Hyaluronidase only works on HA fillers. The PDLLA particles of Juvelook cannot be degraded by enzymes, so other treatments such as steroid injections are used instead.

How often do Juvelook Volume nodules occur?

Specific figures for Juvelook have not been officially established. However, there are report data showing about 2% to 5% when the injection depth is shallower than 0.5 mm, and it is widely reported up to 6% to 44% for PLLA lines in general.

Will nodules disappear on their own?

Small, asymptomatic nodules may resolve over time, but not all of them do. If they are hard, growing, or accompanied by inflammation, treatment is required, so it is safest to determine through medical diagnosis.

Can a lump suddenly appear several months after the procedure?

Yes. Delayed-onset nodules (foreign body granulomas) can appear even after several months to over a year. If you feel a lump late, we recommend not leaving it alone but seeking medical advice.

Will the nodule go away if I massage it at home?

It is not recommended. Pressing hard or rubbing can cause greater irritation and worsen the condition. Professional medical diagnosis should prioritize self-treatment.