The Guide to Laser Skin Resurfacing for Acne Scars

Once acne clears, the marks it leaves can feel like a second, quieter battle. Flat discoloration usually fades on its own. But true textural scars — the pits, craters, and undulations — don’t fade with time or creams. Treating them means remodeling the skin itself, and laser skin resurfacing is one of the most established and effective ways to do that.

One framing note before we start: laser resurfacing treats scars (texture). It is not a treatment for active acne — that’s a different goal addressed by different lasers. Make sure your active acne is well controlled before pursuing scar treatment, or new breakouts can create new scars.

What is laser skin resurfacing?

Laser skin resurfacing uses focused light energy to remodel scarred skin. Broadly, it works two ways at once: by removing or heating damaged tissue, and by stimulating the skin’s natural wound-healing and collagen production to rebuild smoother, more even texture over the following weeks and months.

For atrophic (depressed) acne scars, the goal is to soften scar edges, encourage new collagen to “fill” depressions from below, and blend the scarred area into the surrounding skin. The improvement is gradual and continues as collagen remodels.

The main types of resurfacing lasers

Ablative vs. non-ablative — the key distinction

• Ablative lasers remove the outer layers of skin and heat the deeper layers, prompting strong collagen remodeling. They’re the most powerful for scars but come with the most downtime and risk.
• Non-ablative lasers leave the surface largely intact and heat the deeper layers to stimulate collagen. Gentler, with less downtime — but generally less dramatic improvement per session, so more sessions are usually needed.

Fractional vs. fully ablative

A major advance was making lasers fractional — treating the skin in a grid of tiny columns rather than its entire surface, leaving healthy skin between treated zones. This dramatically speeds healing and lowers risk compared with older fully-ablative resurfacing, while preserving much of the benefit. Most modern resurfacing is fractional.

The common devices

• Fractional ablative CO₂ laser: often regarded as the gold standard for atrophic acne scars, with strong remodeling power — but the most downtime and the highest risk of pigment changes, especially in deeper skin tones.
• Fractional ablative Er:YAG laser: similar ablative category, sometimes with slightly less thermal effect and downtime than CO₂.
• Non-ablative fractional lasers (e.g., 1540/1550 nm): less downtime and lower pigment risk; gentler results, more sessions.

A related (technically non-laser) energy treatment, radiofrequency microneedling, is frequently compared with laser resurfacing and discussed below.

How laser resurfacing works on scars

• Targeted energy is delivered into the skin in tiny treatment zones.
• Tissue is ablated and/or heated, removing or remodeling scar tissue and creating microscopic zones of controlled injury.
• Wound healing is triggered, and over the following weeks the skin produces new collagen and elastin.
• Texture improves gradually as that new collagen fills and smooths atrophic scars and blends edges.

Because the benefit comes from a remodeling process, results build over months, and a series of sessions is usually needed for best effect.

What to expect: treatment and recovery

Before treatment

A consultation assesses your scar types, skin tone, history, and goals, and confirms active acne is controlled. Your provider may recommend pre-treatment skin prep, and (especially in deeper skin tones) measures to reduce pigment risk. Sun avoidance beforehand is typically advised.

During treatment

A numbing cream (and sometimes other anesthesia) is applied for comfort. The laser is passed over the treatment area; sensations range from warmth to a stronger prickling/heat depending on the device. Sessions commonly last from a few minutes to under an hour.

Recovery (the part to plan for)

• Ablative (especially CO₂): expect several days to about a week of redness, swelling, oozing or crusting, and peeling as the skin heals. Redness can linger for weeks.
• Non-ablative fractional: usually milder — redness and some swelling for a few days, with a quicker return to normal activities.
• Across all types: strict sun protection during healing is critical to avoid pigment problems.

Who is a good candidate?

• Scar type matters. Boxcar and rolling scars often respond well; deep, narrow ice pick scars respond poorly to resurfacing alone and usually need adjuncts like TCA CROSS or punch excision.
• Active acne should be controlled first.
• Skin tone is a key safety factor. Deeper skin tones have a higher risk of post-treatment pigment changes with ablative lasers, so device choice and settings — or alternatives like RF microneedling — must be considered carefully.
• Realistic expectations are essential.
• Certain conditions, recent isotretinoin use, a tendency to keloid, active infections, and pregnancy may affect timing or suitability.

How much does laser resurfacing cost?

• Treatment is usually delivered as a series of sessions, and total cost reflects that.
• It’s generally considered cosmetic and not covered by insurance.
• More aggressive ablative treatment may need fewer sessions but has higher downtime; gentler approaches cost less per session but often need more.

A consultation should provide transparent, specific pricing for your plan.

Is laser resurfacing safe? The real risks

Resurfacing is well established, but it is a genuine procedure with genuine risks — more so than treatments for active acne. Potential effects include redness, swelling, and crusting during healing; temporary or, less commonly, lasting pigment changes (both darkening and lightening, with higher risk in deeper skin tones); prolonged redness; infection or, rarely, scarring if healing is disrupted; and reactivation of cold sores in susceptible people. The single biggest safety factor is the skill and experience of the provider, particularly with your skin tone.

How effective is it? What the evidence shows

• Ablative and non-ablative fractional resurfacing can produce meaningful improvement, with studies reporting scar improvements ranging from roughly 25% to over 75%, depending on modality and number of treatments.
• Fractional ablative CO₂ tends to deliver the strongest results. A meta-analysis pooling eight RCTs (249 patients) comparing fractional CO₂ with RF microneedling found CO₂ superior for efficacy and satisfaction — but with significantly more pain, higher risk of PIH, and longer-lasting redness.
• Non-ablative options improve scars more modestly but with less downtime and lower pigment risk.
• Combination approaches (e.g., subcision plus laser for rolling scars; CROSS or punch for ice pick scars) often outperform any single method.

The recurring theme: there’s a genuine efficacy-versus-tolerability trade-off, and the best choice is individualized — not a one-size-fits-all “best laser.”

How laser resurfacing compares to other scar treatments

• Microneedling: gentler and lower-cost, with less downtime, but generally less powerful than ablative laser for deeper scars.
• Radiofrequency (RF) microneedling: lower pigment risk (attractive for darker skin tones) and good results, though possibly somewhat less effective than fractional CO₂ for some scars — with better tolerability.
• Subcision: releases the fibrous bands tethering rolling scars; often combined with resurfacing.
• TCA CROSS: focused chemical application ideal for ice pick scars.
• Punch techniques: for deep or discrete scars like ice pick and some boxcar scars.
• Fillers: can temporarily (or more durably) lift depressed scars.

The bottom line

Laser skin resurfacing is a powerful, well-evidenced way to improve atrophic acne scars by remodeling the skin and stimulating new collagen. Ablative fractional CO₂ tends to give the strongest results, with non-ablative and RF-microneedling options offering gentler, lower-risk alternatives. It works best on boxcar and rolling scars, needs adjuncts for ice pick scars, requires controlled active acne first, and demands careful provider selection — especially for deeper skin tones. Go in with realistic expectations: resurfacing improves scars, often substantially, but rarely erases them completely.