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- What they are: lumps that can appear after treatment with a poly-L-lactic acid collagen biostimulator.
- Not all alike: they may be non-inflammatory, inflammatory, infectious, or of another origin.
- Most important: never massage a persistent or painful lump blindly, and do not try to „dissolve“ it at home.
- Assessment: contact the doctor who performed the treatment; redness, warmth, severe pain, discharge or fever call for a prompt review.
PLLA biostimulators stimulate collagen production gradually. Like any injectable treatment, they can cause adverse reactions. One of them is a palpable or visible nodule. This page explains how the risk is reduced and why treatment is chosen only after an assessment.
What is a PLLA nodule?
A nodule is a well-defined thickening that can be felt, and sometimes seen. An early, soft irregularity immediately after injection is not the same as a firm nodule that appears later. A clinical examination must distinguish a non-inflammatory product deposit, an inflammatory or immune reaction, infection or biofilm, and other changes unrelated to PLLA.
A product name alone does not make the diagnosis. What matters is when the lump appeared, pain, redness, warmth, change in size, previous fillers and treatments, and the layer into which the product was injected.
How the risk is reduced
1. Correct indication and anatomy
PLLA is not a substitute for a hyaluronic acid filler in every area. Thin and highly mobile zones require particular caution. Use outside the approved indication must be clearly identified as off-label and explained to the patient beforehand.
2. Product preparation and technique
Reconstitution, dilution, depth and even distribution must follow the specific manufacturer’s instructions and current professional recommendations. Protocols are not interchangeable between all PLLA products.
3. Conservative, staged planning
Biostimulation is assessed over time. A plan of several controlled stages allows reassessment before the next application. „More at once“ is not a synonym for a better result.
4. Stable skin and a complete medical history
An active infection or inflammation in the treatment area is a reason to postpone. Tell your doctor about previous fillers, biostimulators, implants, dental procedures, medicines and immune system disorders.
5. Aftercare is individual
Massage after PLLA is not a universal instruction. It is done only if recommended for the specific product, technique and patient, exactly in the way the doctor has shown. Aggressive massage of a painful, red or late-appearing lump without an examination can delay the correct diagnosis.
When to contact your doctor
- any lump that persists, grows or becomes visible;
- pain, redness, warmth or swelling that is increasing;
- discharge, a sore, a change in skin colour or fever;
- symptoms that appear weeks or months after treatment.
How is the diagnosis made?
Assessment begins with the medical history and palpation. When the finding is unclear, high-frequency ultrasound can help determine the location, depth and relationship to previously injected materials. Atypical changes may require a microbiological sample, biopsy or histopathology. Treating „blind“ is not harmless, because the therapy for a non-inflammatory nodule is not the same as the therapy for an infection.
How are PLLA nodules treated?
There is no single protocol for all nodules. Depending on the phenotype and findings, options may include monitoring, targeted manual therapy guided by a doctor, intralesional medicines, antimicrobial therapy when infection is reasonably suspected or confirmed, and surgical removal in selected resistant cases. Corticosteroids, 5-fluorouracil and other intralesional therapies are medical procedures; in this indication they may be off-label and require an individual assessment of benefit and risk.
Hyaluronidase does not dissolve PLLA. It has a role only if a hyaluronic acid filler is present in the same area and the doctor judges it to be part of the problem.
Related ESTERA pages
Frequently asked questions
Is every lump a granuloma?
No. A nodule is a clinical description. Granuloma is a histological diagnosis and should not be assumed without appropriate assessment.
Should I massage it straight away?
Only according to the doctor’s instructions for the specific product and the early phase. A painful, red, warm or late-appearing lump should be examined first.
Can PLLA be dissolved?
There is no hyaluronidase equivalent that selectively dissolves PLLA. Treatment depends on the cause and the clinical phenotype.
Is ultrasound always needed?
Not always, but it can help considerably with unclear, deep, multiple or previously treated changes.
References
- Lowe NJ. Understanding, avoiding, and treating potential adverse events following injectable PLLA. J Drugs Dermatol. 2014.
- Consensus recommendations on injectable PLLA. J Cosmet Dermatol. 2024.
- The management of PLLA nodules: a scoping review and evidence-mapped clinical pathway. 2026.
Assessment and treatment planning are individual. Book a consultation.