Does CO2 Laser Resurfacing Work? An Evidence-Based Review

CO2 laser resurfacing is one of the most studied and most aggressive skin treatments offered at med spas and dermatology clinics. The short version, based on decades of clinical research: it works, and for deep wrinkles and certain scars it remains the benchmark that newer devices are measured against. But "works" comes with real caveats around downtime, risk, and skin type, and this review walks through what the published evidence actually shows.

What CO2 Laser Resurfacing Is

CO2 (carbon dioxide) laser resurfacing uses a laser that emits light at a wavelength of 10,600 nanometers. That wavelength is absorbed almost entirely by water, and your skin is mostly water. When the beam hits the surface, it heats the water inside skin cells fast enough to vaporize them. This controlled removal of tissue is called ablation, and it is why CO2 is classified as an ablative laser.

There are two broad ways to use it:

• Fully ablative (traditional) CO2. The laser removes the entire surface layer of skin across the treatment area. This is the original 1990s approach. It produces dramatic results and equally dramatic downtime.
• Fractional ablative CO2. Introduced for resurfacing in 2007, this version drills thousands of tiny microscopic columns into the skin while leaving the skin between those columns intact. The untreated skin acts as a reservoir of healthy cells that speeds healing. Most CO2 treatments offered today are fractional.

The trade-off is straightforward. Fully ablative gives the strongest single-session result but the longest, riskiest recovery. Fractional spreads the work over more sessions with faster healing and fewer complications.

How it differs from other lasers

A quick map helps, because the laser category is crowded and confusing.

CO2 sits at the powerful, high-recovery end of that spectrum. It is not a lunchtime treatment.

How the Mechanism Actually Works

The clinical rationale rests on two effects happening at once.

First, ablation removes the damaged outer skin. Sun-damaged epidermis with irregular pigment, rough texture, and precancerous changes is physically vaporized away, and fresh skin grows back in its place.

Second, thermal stimulation of the deeper skin. The heat that spreads below the ablated zone injures the dermis in a controlled way. According to StatPearls, the standard clinical reference, this residual thermal damage triggers collagen contraction, new collagen production (neocollagenesis), and remodeling of the supportive matrix under the skin. That deeper remodeling is what tightens and smooths over the following weeks and months, and it is the reason results keep improving long after the surface has healed (StatPearls: Laser Carbon Dioxide Resurfacing).

The numbers behind this help explain why CO2 hits harder than its gentler cousins. On a first pass, a CO2 laser vaporizes roughly 20 to 60 micrometers of tissue, while an Er:YAG laser removes only about 3 to 5 micrometers. CO2 also leaves a wider zone of residual heat below the ablated surface, and that heat is exactly what drives collagen contraction and remodeling. In fractional mode, the laser creates microscopic treatment columns less than 400 micrometers across that can reach over 1,000 micrometers deep, each surrounded by untouched skin that supplies healthy cells for rapid healing (StatPearls: Ablative Laser Resurfacing).

That extra depth and heat is a double-edged sword. It is the reason CO2 produces more dramatic tightening and collagen remodeling than Er:YAG, and also the reason it carries a higher rate of pigment changes and a longer recovery. Power and risk move together here.

This two-part mechanism, surface renewal plus deep collagen remodeling, is why CO2 can address problems that surface-only treatments like chemical peels or microdermabrasion cannot reach. The benefit is not instant. Fresh skin re-grows within a couple of weeks, but the deeper collagen rebuild plays out over three to six months, which is why before-and-after photos should be judged at the later mark. For a broader explanation of how collagen stimulation works across treatments, see our collagen science explainer.

What the Evidence Actually Shows

This is where honest grading matters. CO2 has a long research record, but the quality of that record varies by indication. Much of it comes from small split-face trials and observational series rather than large, long-term, placebo-controlled studies. Here is how the evidence breaks down by use.

Wrinkles and photoaging: strong, consistent evidence

This is CO2's home turf, and "photoaging" is the technical term for sun damage: laxity, blotchy color, rough texture, and the static wrinkles that stay even when your face is relaxed. Multiple controlled studies show measurable wrinkle reduction. A study of a multi-modal fractional ablative CO2 device reported an average improvement of roughly 42% in wrinkles along with a meaningful reduction in pigment irregularity (fractional CO2 wrinkle reduction study, PMID 23057708). A split-face trial comparing two fractional CO2 systems on photodamaged facial skin found both produced significant improvement in texture and tone (split-face photodamage trial, PMID 21605239). For the harder problem of static wrinkles around the eyes in Asian skin, a split-face comparison of CO2 fractional modes found all modes produced significant improvement in wrinkles, texture, and elasticity at three months, with a combined "fusion" mode outperforming the others (periocular wrinkle study, PMID 34889041).

A note on study design, since it affects how much trust the numbers deserve. Many of these are "split-face" trials, where one side of the face gets one treatment and the other side gets a comparison, so the same person serves as their own control. That design is genuinely useful because it removes a lot of person-to-person variation. The weakness is that sample sizes are small, follow-up is often only a few months, and outcome scales differ between studies, which makes pooling results into one clean number hard.

The takeaway: for moderate-to-deep wrinkles and overall sun damage, the evidence is solid and consistent in direction even if the exact percentages move around. CO2 outperforms gentler options for these specific problems, and it is the device other resurfacing tools are usually benchmarked against.

Acne scars: good evidence, but combinations often win

CO2 is a mainstay for atrophic (depressed) acne scars, the boxcar, rolling, and icepick scars left behind after inflammatory acne. A 2024 meta-analysis and systematic review directly compared fractional CO2 against fractional Er:YAG for atrophic acne scars and found both effective, with differences mainly in side-effect and recovery profiles rather than a clear efficacy winner (Liu et al. meta-analysis, J Cosmet Dermatol 2024, PMID 38733085).

A useful single trial puts numbers on it. A randomized study of post-acne scarring compared fractional CO2 laser, microneedling, and platelet-rich plasma (PRP) as standalone treatments across four sessions. Fractional CO2 produced about a 68.7% mean improvement, microneedling about 60.3%, and PRP about 31.1%. CO2 was significantly better than PRP alone, while CO2 and microneedling were statistically close on the quantitative scale, and the authors specifically warned that PRP by itself gives unsatisfactory results for scars (Pooja et al. randomized study, Indian Dermatol Online J 2020, PMID 32695692). That single trial is small, so treat the exact percentages as illustrative rather than definitive, but the ranking matches the broader literature.

Across that broader literature, fractional CO2 alone typically produces moderate-to-good improvement, often quoted in the rough range of 40% to 75% depending on scar type, settings, and how improvement is measured. Pairing CO2 with subcision (releasing tethered scars from below), PRP, or microneedling tends to nudge results higher than the laser by itself. Icepick scars, the deep narrow ones, respond least to any laser and often need adjunct techniques.

So CO2 works for acne scars, but if a clinic presents it as a standalone miracle, that overstates the case. The best outcomes in the research come from combination protocols and from matching the technique to the scar type. Compare approaches in our reviews on microneedling vs. chemical peel and laser facial vs. chemical peel.

Other uses: reasonable to limited evidence

CO2 is also used for surgical and traumatic scars, certain precancerous lesions (actinic keratoses), enlarged oil glands (rhinophyma), and skin laxity. StatPearls lists these among accepted indications, supported by the deep ablative and thermal mechanism, though the controlled-trial base for some is thinner than for wrinkles and acne scars (StatPearls: Ablative Laser Resurfacing).

Evidence grade summary

A practical limitation runs through all of it: studies use different devices, settings, and rating scales, and head-to-head long-term comparisons are scarce. The direction of the evidence is favorable, but precise numbers vary from one study to the next.

What Treatment and Recovery Look Like

Knowing the procedure helps set expectations.

Before. A consultation should cover your skin type, history of cold sores, medications (recent isotretinoin is a contraindication), and realistic goals. Many providers prescribe an antiviral to prevent herpes flares and may start a pretreatment skin-prep regimen.

During. Numbing cream, sometimes with local injections or sedation for fully ablative work. A single fractional session usually runs 30 to 90 minutes depending on the area.

After. This is the part people underestimate. Fully ablative CO2 means an open, weeping wound that takes well over a week to seal, followed by redness that can last months. Fractional shortens this considerably. StatPearls reports that re-epithelialization typically occurs about 6 to 7 days after treatment, with swelling and redness persisting for 1 to 2 weeks and lingering inflammation resolving over the following weeks (StatPearls: Laser Carbon Dioxide Resurfacing). A rough timeline for fractional treatment looks like this: days 1 to 3 are the most swollen and raw, with oozing and a sandpaper texture; days 3 to 7 bring crusting and flaking as new skin forms underneath; by the end of week one to two the surface is usually closed but pink. The pinkness then fades over weeks. Strict sun avoidance and diligent moisturizing are non-negotiable during this whole window, because new skin burns and discolors easily. Makeup is typically off the table until the skin has re-sealed.

Sessions. Fully ablative may need only one session. Fractional commonly takes two to four sessions spaced four to eight weeks apart. Collagen remodeling continues for several months, so the final result is judged at three to six months, not at the two-week mark.

Safety, Risks, and Who Should Be Cautious

CO2 is effective partly because it is aggressive, and that aggression carries real risk. This is genuine medical territory, not a spa facial.

The most common short-term effects are redness, swelling, crusting, peeling, and itching during healing. Persistent redness can linger for weeks to months. The complications that matter most:

• Post-inflammatory hyperpigmentation (PIH). Temporary darkening of the treated skin is the most clinically important risk. A dedicated review found reported PIH rates that ranged enormously across studies, anywhere from 0% to 100%, depending heavily on the prevention steps used. Notably, that review reported that Fitzpatrick skin phototype did not clearly predict PIH risk on its own, and that prevention strategies such as platelet-rich plasma were associated with the lowest rates in the studies examined (PIH after CO2 laser review, Dermatology Reports 2023). In real-world practice, providers still treat darker skin tones with extra caution, because PIH there is harder to clear once it occurs.
• Hypopigmentation. Permanent lightening of the skin is a rarer but serious risk, more associated with older fully ablative techniques. Unlike PIH, it may not resolve.
• Scarring and infection. Uncommon with proper technique and aftercare, but possible. Improper laser settings, poor patient selection, or neglected wound care raise the odds.
• Herpes reactivation and acneiform breakouts. Manageable, and antivirals reduce the herpes risk.

Who should be cautious or avoid it: people with active acne or skin infections, recent isotretinoin use (generally within 6 to 12 months), a history of keloid scarring, open wounds, or conditions that worsen with skin trauma such as vitiligo or psoriasis (StatPearls: Laser Carbon Dioxide Resurfacing). Pregnancy is a common reason providers postpone elective resurfacing.

One safety note above all: the single biggest variable in CO2 outcomes is the operator. Device settings, depth, and patient selection determine whether you get a great result or a complication. This is a procedure to have done by an experienced, appropriately licensed provider, not the cheapest option you can find.

This article is for general education and is not medical advice. Talk to a board-certified dermatologist or qualified physician before considering CO2 laser resurfacing.

Cost and Value

CO2 resurfacing is one of the pricier laser treatments because of the device cost, the operator skill required, and the procedure time. Full-face fractional CO2 commonly runs well into four figures per session, and fully ablative single sessions can run higher still. Smaller areas like around the eyes or mouth cost less. Because results last years for many patients, the cost-per-year can compare reasonably to repeated lighter treatments, but the upfront price and downtime are real barriers. For a fuller breakdown across modalities, see our laser treatment cost comparison.

Who CO2 Is Right For

CO2 is a strong fit if you have:

• Moderate-to-deep wrinkles and significant sun damage
• Atrophic acne scars (often best in combination protocols)
• The schedule flexibility to handle real downtime
• Realistic expectations and a willingness to follow strict aftercare

It is a poor fit if you have:

• Only mild texture or tone concerns (gentler treatments make more sense)
• No tolerance for downtime
• Active acne or skin infection
• Recent isotretinoin use or a keloid-prone history
• An expectation that one session permanently stops aging

For milder concerns or shorter recovery, non-ablative or fractional non-ablative lasers, chemical peels, or microneedling are reasonable alternatives that trade some power for less downtime and lower risk. Comparing options honestly with a provider is the right move.

Alternatives Worth Considering

No single treatment is best for everyone. Depending on your concern, these may serve you better:

• Er:YAG laser. Also ablative but with less surrounding heat, generally faster healing, often chosen for milder resurfacing or sensitive areas.
• Non-ablative fractional lasers. Less dramatic per session, far less downtime, good for early aging and tone.
• Chemical peels. Range from light to deep; deep peels rival lasers for some concerns but carry their own risks.
• Microneedling and RF microneedling. Collagen stimulation with less surface disruption.
• IPL/photofacial. For pigment and redness, not texture or wrinkles.

CO2 vs. Er:YAG: The Closest Comparison

Because both are ablative lasers, CO2 and Er:YAG get compared more than any other pair, so it's worth a closer look. Er:YAG runs at 2,940 nm, a wavelength absorbed by water even more avidly than CO2's 10,600 nm. Counterintuitively, that stronger absorption means Er:YAG removes a thinner layer with less spread of heat into surrounding tissue.

The practical consequences, per the clinical literature (StatPearls: Ablative Laser Resurfacing):

• Healing. Er:YAG re-epithelializes faster, often around five days, with redness lasting a few weeks. Fractional CO2 re-epithelializes a little slower, roughly 6 to 7 days, with swelling and redness persisting one to two weeks and beyond, and fully ablative CO2 redness can run weeks to months.
• Result. CO2 generally delivers more dermal collagen remodeling and tightening, which is why it edges out Er:YAG for deeper wrinkles and laxity.
• Side effects. That extra CO2 heat comes with a higher rate of dyspigmentation (pigment changes). Er:YAG is the gentler, lower-risk option but does less tightening.

For atrophic acne scars specifically, the 2024 meta-analysis found the two lasers broadly comparable in efficacy, with the choice coming down to recovery and side-effect tolerance rather than a clear winner (Liu et al. meta-analysis, PMID 38733085). A reasonable rule of thumb: deeper concern and willing to accept downtime, lean CO2; milder concern or faster recovery needed, Er:YAG is worth discussing. A direct head-to-head wrinkle trial of the two lasers also exists and found both effective, again differing mostly in recovery profile (CO2 vs Er:YAG facial wrinkle RCT, PMID 27885522).

How to Choose a Provider

Since operator skill is the single biggest driver of results and complications, vetting matters more here than for almost any cosmetic treatment. A few practical filters:

• Credentials. A board-certified dermatologist or plastic surgeon, or a clinic where a qualified physician directly oversees the laser. In many areas, who is legally allowed to operate ablative lasers is regulated, so ask.
• Skin-type experience. If you have a deeper skin tone, ask specifically how many patients with skin like yours they have treated with CO2 and what their PIH-prevention protocol is.
• Honest expectations. A good provider will talk you out of CO2 if your concern is mild, and will be candid about downtime and risk. A red flag is anyone promising zero downtime from an ablative laser.
• Aftercare plan. They should give you a written wound-care and sun-protection plan and a way to reach them if something looks wrong during healing.

To compare what these treatments run in different markets, see our laser treatment cost comparison, and to understand where CO2 fits among the menu of options, our laser facial vs. chemical peel breakdown helps frame the trade-offs.

The Bottom Line

Does CO2 laser resurfacing work? Yes. For deep wrinkles, photoaging, and atrophic acne scars, the published evidence consistently supports meaningful improvement, and CO2 remains the powerful benchmark in the resurfacing category. The honest caveats are that much of the data comes from small or short-term studies, results vary with device and operator, downtime is significant, and pigment changes are a real risk that demands careful provider selection and aftercare. If your concerns are mild or you can't accept downtime, a gentler treatment is the smarter choice. If your concerns are substantial and you go to an experienced provider with eyes open to the risks, CO2 delivers some of the strongest results in non-surgical skin resurfacing.

Frequently Asked Questions

How long do CO2 laser resurfacing results last?

Results are long-lasting because the treatment renews the surface and remodels deeper collagen. Many patients see improvement that holds for several years, especially with strict sun protection. It does not stop future aging, so touch-ups or maintenance treatments may be wanted over time.

Is CO2 laser safe for darker skin tones?

It can be done, but with caution. Post-inflammatory hyperpigmentation is the main concern. Interestingly, one review found Fitzpatrick skin type alone did not cleanly predict PIH risk, with prevention steps mattering more, but in practice experienced providers use conservative settings and prevention protocols for darker skin because pigment problems are harder to reverse there. Choosing a provider experienced with skin of color is essential.

How many CO2 laser sessions will I need?

It depends on the approach. Fully ablative CO2 is often a single session. Fractional CO2 commonly takes two to four sessions spaced several weeks apart, with the full result judged at three to six months as collagen continues to remodel.

Is CO2 laser better than Er:YAG or microneedling?

For deep wrinkles and significant sun damage, CO2 is generally the most powerful option. For atrophic acne scars, a 2024 meta-analysis found CO2 and Er:YAG similarly effective, differing mainly in recovery. Microneedling is gentler with less downtime but usually less dramatic per session. The "best" choice depends on your specific concern, skin type, and downtime tolerance.

What is the recovery like after CO2 laser?

Expect redness, swelling, crusting, and peeling. Fractional CO2 surface skin typically re-seals in about a week (roughly 6 to 7 days), with redness and swelling that can persist one to two weeks or longer. Fully ablative recovery is more involved and longer. Diligent moisturizing and strict sun avoidance during healing are critical to a good outcome.