CO2 Laser vs Fractional Laser: Which Is Better for Acne Scars?

CO2 laser and fractional laser are both used to improve acne scars, but the terms can be confusing because CO2 laser can itself be a fractional laser. The more useful comparison is usually between fractional CO2 laser and other fractional laser technologies, such as fractional Er:YAG or non-ablative fractional lasers.

Fractional treatments create microscopic treatment zones rather than resurfacing the entire skin surface. The main differences are the laser wavelength, whether the treatment is ablative or non-ablative, the intensity of resurfacing, and the expected recovery period.

For international patients considering acne scar treatment in Korea, understanding these differences can help when comparing laser devices and treatment plans.

What Is Fractional CO2 Laser?

Fractional CO2 laser is an ablative fractional resurfacing treatment that uses approximately 10,600 nm carbon dioxide laser energy. It creates controlled microscopic columns of thermal injury in the skin while leaving surrounding tissue untreated.

The healing process stimulates collagen remodeling and can gradually improve the appearance of depressed acne scars and uneven texture.

Fractional CO2 may be used for:

• Atrophic acne scars
• Boxcar scars
• Some rolling scars
• Uneven skin texture
• Enlarged pores
• Fine lines
• Photodamaged skin

Because CO2 is ablative, it generally produces more surface injury and recovery than many non-ablative fractional treatments.

What Is a Fractional Laser?

“Fractional laser” describes a treatment method, not one specific laser.

Fractional lasers can be either ablative or non-ablative and may use different wavelengths. Common examples include:

• Fractional CO2 laser
• Fractional Er:YAG laser
• Fractional Er:Glass laser
• Other non-ablative fractional laser systems

These lasers divide the treatment into microscopic zones, allowing untreated skin between treatment columns to assist with healing.

Therefore, saying “CO2 vs fractional laser” is technically not an exact comparison. Fractional CO2 is one type of fractional laser.

Fractional CO2 vs Other Fractional Lasers: Key Differences

The biggest differences are the wavelength, depth, degree of tissue ablation, and recovery period.

Fractional CO2

• Wavelength: Approximately 10,600 nm
• Type: Ablative fractional laser
• Main effect: Resurfacing and collagen remodeling
• Common concerns: Acne scars, texture, wrinkles
• Treatment intensity: Can be adjusted from moderate to more intensive resurfacing
• Recovery: Usually longer

Non-ablative Fractional Laser

• Type: Non-ablative fractional treatment
• Main effect: Controlled thermal stimulation without removing the skin surface
• Common concerns: Mild acne scars, texture, pigmentation, fine lines
• Treatment intensity: Generally less aggressive
• Recovery: Usually shorter

Fractional Er:YAG or Er:Glass

• Type: Can be ablative or non-ablative depending on the system
• Main effect: Controlled resurfacing or dermal remodeling
• Common concerns: Acne scars, texture, fine lines
• Recovery: Often shorter than more aggressive fractional CO2 treatment

Recent comparative evidence suggests that fractional CO2 may produce a stronger clinical response in some acne-scar studies, while erbium-based fractional lasers can offer shorter recovery and less procedural discomfort.

Fractional CO2 vs Fractional Laser for Acne Scars

The type of acne scar is one of the most important factors in choosing a treatment.

Fractional CO2 can be useful when the main concern is pronounced textural irregularity or depressed scars because ablative resurfacing can stimulate substantial collagen remodeling.

Less aggressive fractional laser treatments may be considered when:

• Scarring is relatively mild
• Skin texture is the primary concern
• Minimal downtime is important
• The patient has a higher concern about post-inflammatory pigmentation
• A gradual treatment approach is preferred

However, treatment response varies substantially depending on scar depth, skin type, laser settings, and the specific device.

Fractional CO2 for Boxcar and Rolling Scars

Boxcar scars have relatively defined depressed edges, while rolling scars typically have broader, softer depressions and may involve fibrous tethering beneath the skin.

Fractional CO2 can improve the surface appearance of both types through resurfacing and collagen remodeling.

However, rolling scars caused by deeper tethering may not respond fully to laser treatment alone. Subcision or another scar-release procedure may be considered when fibrous attachments are contributing significantly to the depression.

This is why acne scar treatment is often more effective when the treatment is matched to the scar structure rather than applying the same laser protocol to the entire face.

Fractional CO2 for Ice-Pick Scars

Ice-pick scars are narrow and extend relatively deeply into the skin. They can be more difficult to improve with broad fractional resurfacing alone.

Depending on their depth and structure, a dermatologist may discuss more targeted procedures such as:

• TCA CROSS
• Punch techniques
• Targeted resurfacing
• Fractional laser
• Combination treatment

Fractional CO2 can still play a role in improving overall texture, but it may not completely correct deep, narrow scars by itself.

Fractional CO2 vs Non-Ablative Fractional Laser: Results

Both ablative and non-ablative fractional lasers can improve atrophic acne scars.

A 2025 meta-analysis comparing ablative and non-ablative laser treatments found that both approaches can improve acne scarring, with differences in efficacy and safety depending on the specific treatment.

More recent 2026 evidence comparing fractional CO2 with erbium-based fractional lasers found a possible clinical-response advantage for CO2, although randomized-only analysis reduced the certainty of that difference. The same analysis found more pain and several additional days of downtime with fractional CO2.

This means treatment intensity should be balanced against recovery expectations rather than assuming that the most aggressive laser is appropriate for everyone.

Fractional CO2 vs Fractional Laser for Darker Skin

Skin tone is particularly important when considering ablative resurfacing.

Fractional CO2 can cause temporary pigmentation changes, and patients who are prone to post-inflammatory hyperpigmentation may require more conservative treatment settings and careful aftercare.

Some less aggressive fractional technologies may provide a shorter recovery period and potentially lower treatment burden.

However, the risk of pigmentation changes depends on several factors, including:

• Skin type
• Laser wavelength
• Treatment intensity
• Energy settings
• Previous inflammation
• Sun exposure
• Individual tendency toward pigmentation

A dermatologist should assess these factors before selecting the treatment.

Fractional CO2 vs Fractional Laser: Downtime

Recovery is one of the clearest differences between more intensive fractional CO2 and less aggressive fractional treatments.

After fractional CO2, patients may experience:

• Redness
• Swelling
• Warmth or burning
• Peeling
• Crusting
• Temporary sensitivity
• Temporary pigmentation changes

Non-ablative fractional treatments generally produce less surface injury and may involve:

• Mild redness
• Warmth
• Swelling
• Temporary sensitivity
• Mild roughness

The exact recovery period depends on the device and treatment settings. A more aggressive fractional treatment will generally require more healing time.

CO2 Laser vs Fractional Laser Cost in Korea

Prices in Korean dermatology clinics vary according to the laser device, treatment area, scar severity, treatment intensity, and number of sessions.

As a broad 2026 reference:

Fractional CO2 Laser

• Approximately ₩150,000–₩600,000+ per facial session
• More intensive resurfacing or combination treatment can cost more

Other Fractional Laser Treatments

• Approximately ₩100,000–₩500,000+ per session
• Premium devices and combination protocols may cost more

When comparing prices, confirm the exact laser model, treatment area, number of passes or treatment zones, and whether anesthesia or post-treatment care is included.

Can Different Fractional Lasers Be Combined?

Some acne scar treatment plans use more than one modality, especially when patients have different scar types or concerns.

For example, a dermatologist may use a fractional laser for overall texture while adding a scar-specific procedure for deep tethered or ice-pick scars.

Combining several lasers is not automatically necessary. Excessive treatment can increase inflammation and recovery time without necessarily producing proportional improvement.

The treatment plan should be based on scar morphology, skin condition, and previous treatment history.

Which Fractional Laser Should You Consider?

Fractional CO2 may be discussed when:

• Atrophic acne scars are a major concern
• Texture irregularity is pronounced
• More intensive resurfacing is appropriate
• You can accommodate longer downtime
• Your skin has a suitable risk profile for ablative treatment

A less aggressive fractional laser may be discussed when:

• Acne scars are relatively mild
• Skin texture is the main concern
• Minimal recovery is important
• You have concerns about post-inflammatory pigmentation
• A gradual treatment approach is preferred

The exact choice depends on the laser technology available, treatment settings, skin type, and scar characteristics.

Final Thoughts

CO2 laser and fractional laser are not completely separate categories. Fractional CO2 is itself a type of fractional laser treatment. The more meaningful comparison is between fractional CO2 and other fractional technologies, particularly ablative and non-ablative systems.

Fractional CO2 can provide intensive resurfacing and collagen remodeling for atrophic acne scars, but it generally involves more discomfort and downtime. Other fractional lasers may provide gradual scar and texture improvement with a shorter recovery period.

Recent comparative evidence indicates that fractional CO2 may offer a stronger clinical response in some studies, while less aggressive erbium-based fractional treatments can provide advantages in pain and recovery.

For international patients seeking acne scar treatment in Korea, the appropriate choice depends on the scar type, skin tone, severity of texture irregularity, treatment intensity, pigmentation risk, and available recovery time. A professional assessment can help determine which fractional technology and treatment settings are appropriate for your skin.