Is fractional CO2 better than a non-ablative laser?

Not on the pooled evidence. A meta-analysis of eight studies found no significant difference between fractional CO2 and non-CO2 laser therapies on clinical improvement, observer assessment (p = 0.19), patient assessment (p = 0.91), or the incidence of post-inflammatory hyperpigmentation (p = 0.69). The reviewers describe the efficacy as appearing equal, and call for better-designed trials.

So why is ablative sold as the stronger option?

Because it is more aggressive, which is not the same as more effective. Ablative lasers remove tissue in each column and need more recovery. If the outcome measures come out level, the extra downtime is a cost you are paying without a matching benefit in the trial data.

How much downtime should I plan for?

This is the question that should decide your choice, and it depends on the device and settings rather than the brand name. Ask the clinic to describe the expected days of redness and peeling for the exact settings they intend to use, and plan your trip around that rather than around the treatment date.

What should I ask a South Korean clinic?

Which platform, ablative or non-ablative, and at what settings for your skin type. What recovery to expect in days. What their plan is if pigmentation darkens afterwards. And the Korean product name of the device, so you can check the licence.

Treatments · also called 프락셀, 프락셔널 레이저, fractional CO2

Fractional laser: ablative or not, the trials came out level

Pooled trials found no difference between ablative and non-ablative fractional lasers — on results or on pigmentation risk. Downtime is what changes.

Author: Aesthetics Korea Editorial Team
Medical review: Reviewed by 2 doctorsSee methodology
Published: 8 September 2026
Last updated: 8 September 2026
Last reviewed: —5 min read

Short answer

Fractional lasers deliver energy in columns, leaving untreated skin between them to speed healing. The pooled evidence does not support the assumption that the more aggressive option works better: a meta-analysis of eight studies found no significant difference between fractional CO2 and non-CO2 lasers on clinician assessment, patient assessment, or the incidence of post-inflammatory hyperpigmentation. What separates them is recovery time and pain.

Key facts

What it is: Laser energy in microscopic columns, with untreated skin between them to speed healing
Two families: Ablative (CO2, Er:YAG) removes tissue in each column; non-ablative heats without removing it
Pooled result: No significant difference between fractional CO2 and non-CO2 on observer or patient assessment
Pigmentation risk: No significant difference in post-inflammatory hyperpigmentation either (p = 0.69)
In Asian skin: Around 5% post-inflammatory hyperpigmentation in a 397-patient comparison in Fitzpatrick III–IV
What actually differs: Downtime and pain, and the experience of the person choosing the settings

What "fractional" means

Not a device — a way of delivering energy. Instead of treating the whole surface, the laser places microscopic columns of injury with untreated skin between them. The intact skin around each column drives the repair, which is why fractional treatment recovers faster than treating everything at once.

Within that, two families:

Ablative — CO2 and Er:YAG. Tissue in each column is removed. More recovery.
Non-ablative — the columns are heated but not removed. Less recovery.

In South Korea both are sold under a crowd of platform names. What you need is which family, and at what settings.

The finding that should change how you choose

The intuition is that ablative is the serious version and non-ablative is the light one. The pooled evidence does not support it.

A meta-analysis of eight studies compared fractional CO2 with non-CO2 laser therapies for acne scars and found no significant difference on:

Clinical improvement
Observer assessment — p = 0.19
Patient assessment — p = 0.91
Post-inflammatory hyperpigmentation — p = 0.69

The reviewers' summary is that the efficacy of fractional CO2 "appeared to be equal to that of non-CO2 laser therapies", with a call for better-designed trials.

Two honest caveats. Eight studies is not a large body of work, and the reviewers say so. And "no significant difference" in a small pooled analysis means a difference was not detected, not that one cannot exist.

But it does mean the aggressive option is not carrying evidence the gentler one lacks — including on the pigmentation risk that matters most in Asian skin.

What the risk actually looks like in Asian skin

Numbers rather than warnings.

A 2025 propensity-score-adjusted study of 397 patients with Fitzpatrick skin types III–IV found post-inflammatory hyperpigmentation in 5.42% treated with fractional laser and 4.71% with fractional radiofrequency — no significant difference. Post-treatment scarring was under 1% for the laser group. No infections.

That is a genuine risk worth a conversation, and it is not the reason to avoid the treatment.

Against RF microneedling

The same study is the useful head-to-head, because both are offered for the same problem.

At six months, 88.1% of the radiofrequency group and 71.9% of the laser group reached at least 25% improvement (p = 0.031), with mean improvement of 54.9% against 47.5% — a difference that did not reach significance (p = 0.059). Radiofrequency was significantly more painful: 5.65 against 4.14 out of 10.

The authors conclude that both are effective and well tolerated in this population. So this is a choice between two workable options, not a right and a wrong one.

What should actually decide it

Since the outcome data do not separate the options, decide on the things that do differ:

Downtime. Ablative needs more. If you are here for eight days, that is a real constraint.
Pain. Higher with radiofrequency in the head-to-head; higher with ablative among lasers.
Your skin type and history. If you pigment easily or have pigmented after a previous procedure, say so before anything else.
The operator. Across every evidence base on this site, settings and experience move outcomes more than the brand does.

What to ask at a consultation

Ablative or non-ablative, and why that one for me?
What settings, and what recovery should I expect in days?
What is the plan if I hyperpigment afterwards — and can you treat it before I fly home?
How many sessions, at what interval, and what is the total?
What is the device's Korean product name?

The bottom line

Fractional lasers work in columns, and the pooled trials found fractional CO2 and non-ablative lasers equal on clinician assessment, patient assessment and pigmentation risk — so the more aggressive option is not buying a better result in the data. In Fitzpatrick III–IV skin, post-inflammatory hyperpigmentation ran around 5% for both fractional laser and fractional radiofrequency. Choose on downtime, pain, and the operator, and ask what happens if you pigment before you leave the country.

Frequently asked questions

Is fractional CO2 better than a non-ablative laser?: Not on the pooled evidence. A meta-analysis of eight studies found no significant difference between fractional CO2 and non-CO2 laser therapies on clinical improvement, observer assessment (p = 0.19), patient assessment (p = 0.91), or the incidence of post-inflammatory hyperpigmentation (p = 0.69). The reviewers describe the efficacy as appearing equal, and call for better-designed trials.
So why is ablative sold as the stronger option?: Because it is more aggressive, which is not the same as more effective. Ablative lasers remove tissue in each column and need more recovery. If the outcome measures come out level, the extra downtime is a cost you are paying without a matching benefit in the trial data.
Does it cause hyperpigmentation in Asian skin?: It can, and the rate is lower than most people fear. A 2025 propensity-adjusted comparison of 397 patients with Fitzpatrick skin types III–IV found post-inflammatory hyperpigmentation in 5.42% treated with fractional laser and 4.71% with fractional radiofrequency — no significant difference. That is a real risk to discuss, not a reason to rule the treatment out.
Fractional laser or RF microneedling?: Both work. In the same 397-patient comparison, 88.1% of the radiofrequency group and 71.9% of the laser group reached at least 25% improvement at six months, with mean improvement of 54.9% against 47.5% — a difference that did not reach significance. Radiofrequency was significantly more painful (5.65 against 4.14 out of 10). The authors conclude both are effective and well tolerated.
How much downtime should I plan for?: This is the question that should decide your choice, and it depends on the device and settings rather than the brand name. Ask the clinic to describe the expected days of redness and peeling for the exact settings they intend to use, and plan your trip around that rather than around the treatment date.
What should I ask a South Korean clinic?: Which platform, ablative or non-ablative, and at what settings for your skin type. What recovery to expect in days. What their plan is if pigmentation darkens afterwards. And the Korean product name of the device, so you can check the licence.

Medical evidence

Systematic review2021
The efficacy of fractional CO2 laser in acne scar treatment: A meta-analysis
"There was no significant difference between fractional CO2 laser and non-CO2 laser therapies in terms of clinical improvement, observer assessment (P = .19), patient assessment (P = .91), and incidence of post-inflammatory hyperpigmentation (P = .69)… The efficacy of fractional CO2 laser therapy in acne scars appeared to be equal to that of non-CO2 laser therapies."
Cohort study2025n = 397
Comparative Effectiveness and Safety of Fractional Laser and Fractional Radiofrequency for Atrophic Acne Scars: A Retrospective Propensity Score Analysis
"Both fractional laser and fractional radiofrequency are effective and well-tolerated energy-based devices for the treatment of atrophic acne scars in Thai patients with Fitzpatrick skin types III–IV."

Sources

Listed in the order they are used. Source class follows the methodology.

1.The efficacy of fractional CO2 laser in acne scar treatment: A meta-analysis, Dermatologic Therapy, 2021Peer-reviewed researchaccessed 2026-09-08Eight studies pooled. No significant difference between fractional CO2 and non-CO2 laser therapies on clinical improvement, observer assessment (p = 0.19), patient assessment (p = 0.91), or post-inflammatory hyperpigmentation (p = 0.69). Length of follow-up had little effect on the estimate. The reviewers call for better-designed randomised trials and standard evaluation criteria.
2.Comparative Effectiveness and Safety of Fractional Laser and Fractional Radiofrequency for Atrophic Acne Scars: A Retrospective Propensity Score Analysis, Life (Basel), 2025Peer-reviewed researchaccessed 2026-09-08397 patients (254 fractional laser, 143 fractional radiofrequency), Fitzpatrick skin types III–IV, Thai population, propensity-score adjusted retrospective cohort. At six months, 88.1% of the radiofrequency group and 71.9% of the laser group reached at least 25% improvement (p = 0.031); mean improvement 54.89% against 47.53% (p = 0.059). Post-inflammatory hyperpigmentation 5.42% with laser and 4.71% with radiofrequency (p = 1.000). Pain significantly higher with radiofrequency (5.65 ± 1.74 against 4.14 ± 1.83, p < 0.001). No infections reported.
3.의료기기 안심책방 (MFDS medical device information portal), Ministry of Food and Drug SafetyGovernment / public bodyaccessed 2026-09-08Where the Korean licence for a specific laser platform is looked up, under its Korean product name.

Concerns it addresses

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