What are the differences between thread lift types (PDO, PLLA, collagen, and barbed threads)?
There are various types of threads used in a thread lift, each with its own unique characteristics. Understanding the differences between these skin-lifting threads allows you to discuss with your doctor and choose the most suitable option for your skin condition and aesthetic goals.
Quick Summary: Lifting threads differ along two independent axes. The first axis is shape: smooth (mono) threads have no barbs and are used solely to stimulate localized collagen production; barbed (cog) threads have tiny hooks that anchor into tissue to provide immediate mechanical lifting. The second axis is material: PDO absorbs the fastest, while PLLA and PCL absorb more slowly and focus on prolonged collagen stimulation. The appropriate thread type is selected by your physician after palpating the tissue and assessing skin elasticity—it cannot be chosen from a comparison chart.
Why Are There So Many Types of Lifting Threads?
Because "thread lift" actually combines two distinct mechanisms under one name: mechanical lifting and stimulating the body's natural collagen production. A thread may focus primarily on the former, the latter, or provide a moderate combination of both.
Therefore, asking "which thread is better?" is the wrong question. The right question is: does my concern require structural lifting or dermal thickening?—and that can only be answered after an in-person examination.
Axis 1 — How Do Smooth and Barbed Threads Differ?
| Smooth Threads (mono, screw) | Barbed Threads (cog, barb) | |
|---|---|---|
| Structure | Smooth filament, no barbs | Cut or molded barbs along the thread body |
| Primary Mechanism | Stimulates collagen along the thread tract | Barbs anchor into tissue and pull upward—immediate mechanical lift |
| Visible Results | Gradually, alongside collagen synthesis | Immediate visible lift, stabilizing over time |
| Indicated For | Thickening the dermis, improving skin texture | Areas requiring true lifting: cheeks, jawline, brow lift |
| Specific Risks | Minimal | Thread extrusion / visibility if placed superficially or in very thin tissue |
"Thread protrusion through the skin" is one of the critical signs requiring immediate medical notification according to BonBoz Clinic's Post-Procedure Care Guidelines—and this risk is specifically associated with barbed threads, not smooth threads.
Axis 2 — How Do the Materials Differ?
| Material | Characteristics | Primary Focus |
|---|---|---|
| PDO (polydioxanone) | Familiar medical suture material; fastest absorption rate among the three | Short-term collagen stimulation; commonly used for smooth threads |
| PLLA (poly-L-lactic acid) | Absorbs more slowly than PDO | Longer-lasting collagen biostimulation |
| PCL (polycaprolactone) | Slowest absorption rate among common materials | Longest duration of sustained results |
Note on reading this comparison: slower absorption does not equate to being "better." While slower-absorbing materials sustain effects longer, they also remain inside the body longer—a clinical trade-off that the physician evaluates on an individual basis, rather than a universal quality ranking.
Regarding "Collagen Threads": This is a commercial marketing term emphasizing the collagen-stimulating mechanism, not a distinct fourth material. When presented with this name, ask directly: what is the actual material, and is it smooth or barbed?
Who Decides Which Thread to Use?
The physician, following a clinical examination. Four factors determine the selection, none of which can be evaluated through photographs alone:
- 1Degree of skin laxity—mild, moderate, or pronounced excess skin
- 2Skin elasticity—evaluated by the physician through palpation and pinch testing
- 3Tissue thickness in the treatment area—thin tissue carries a higher risk of barbed thread visibility
- 4Your treatment goals—pronounced structural lifting versus overall skin thickening and smoothing
You have the right to ask and should inquire: what type of thread is being used for me, what is the material, is there verifiable documentation of its origin, and why was it chosen over alternative options?
Post-Procedure Care: Standard Protocol for All Thread Types
According to BonBoz Clinic's Post-Procedure Care Guidelines for bio-absorbable thread lifts:
- Avoid water contact for the first 4 hours; gently cleanse the treatment area with physiological saline
- Sleep on your back with your head elevated for 1 week
- Apply topical antibiotic ointment to the treated area for the first 3 days as directed
- Apply cold compresses for the first 2 days; warm compresses may be used starting from day 3
- Wear a facial compression garment continuously during week 1; wear for 10–12 hours/day during weeks 2–4
- Do not massage or apply strong pressure to the treated area
- Mild tightness and slight tenderness are normal and will gradually subside within 1–4 weeks
Follow-up consultations are scheduled at 1–2 weeks to evaluate initial results, followed by periodic reviews at 1, 3, and 6 months.
Contact the physician immediately if you experience: abnormal severe swelling or purulent discharge · fever above 38.5°C · severe redness and pain that does not subside after 3 days · thread protruding through the skin. Hotline: 0869 612 310 – 1900 5309.
References
- ASPS — Facelift, accessed 03/10/2026
- NHS — Non-surgical cosmetic procedures, accessed 03/10/2026
Frequently Asked Questions
Are barbed threads better than smooth threads?
They cannot be directly compared because they serve two distinct purposes. Barbed threads provide mechanical lifting, whereas smooth threads improve and thicken the dermal foundation. Which option your concern requires is determined following a clinical examination by your physician.
Between PDO, PLLA, and PCL, which lasts the longest?
PCL degrades the slowest and typically yields the longest-lasting results, followed by PLLA, and then PDO. However, slower degradation also means the material remains in the body longer—this is a clinical trade-off, not a measure of superior quality.
What material are "collagen threads" made of?
This is a commercial marketing term emphasizing the mechanism of collagen stimulation, not a unique material. If this term is used, ask directly for the specific material—whether it is PDO, PLLA, or PCL—and whether the thread is smooth or barbed.
Can multiple types of threads be combined in a single session?
Yes, and this is quite common—for instance, utilizing barbed threads where structural lifting is required, alongside smooth threads to thicken and firm the surrounding skin. This decision is made by the physician based on the specific anatomical needs of each facial zone.
This article is for reference only and does not replace an in-person examination or a doctor's diagnosis. Actual results vary by individual condition.