Acne affects 80% of individuals between the ages of 11 and 30, and for most of these individuals, scarring occurs at rates as high as 95% for those who develop inflammatory acne, making acne one of the most common conditions treated by dermatologists in Australia. Demand for effective scar management is not a niche concern. Laser skin resurfacing is one of the primary evidence-based options, delivered in specialised settings such as The Skin Clinic where treatment plans are constructed around the type of scar, skin tone, and severity rather than a one-size-fits-all standard protocol.
Why Does Scar Type Determine What Treatment Can Achieve?
There are various types of acne scars: Ice-pick, boxcar, and rolling scars vary in depth, structure, and how they respond to treatment. About 80% to 90% of acne scarring is due to atrophic scars, making laser resurfacing a viable option. The mechanism is the same for all the technologies: controlled energy produces tiny zones of injury that initiate wound-healing responses and collagen remodelling. Histological studies show measurable increases in dermal collagen production within three to six months after treatment.
That timeline is important in setting expectations. Laser resurfacing does not immediately show improvement, as a topical treatment might seem to do. The biological process it triggers takes months to deliver its complete effect. Patients who evaluate results at six weeks are looking at an incomplete picture. Fractional laser systems, which create treatment zones while leaving surrounding tissue intact, heal faster than fully ablative resurfacing. The collagen remodelling that drives long-term scar improvement unfolds on the same biological timeline regardless of the platform.
What Does the Evidence Actually Show About Improvement Rates?
In a 2021 meta-analysis of eight studies, fractional CO₂ laser treatment showed significant improvement in the appearance of acne scars, with both observer and patient assessments finding noticeable reduction after treatment. Later systematic reviews placed average improvement rates for fractional CO₂ laser therapy at 30% to 70% in scar appearance, with outcomes dependent upon scar severity and treatment intensity. In clinical practice, this translates to patients with moderate rolling and boxcar scars typically having higher improvement than patients with deep ice-pick scars.
Further precision can be found in comparative data between laser technologies. In one study comparing four systems, CO₂ resurfacing produced a mean improvement score of 6.0 of 10, Er lasers 5.8, ablative fractional lasers 5.2, and non-ablative fractional lasers only 2.2 of 10. That gap between ablative and non-ablative is meaningful. Aggressive resurfacing techniques produce the most effective clinical results, but they also require longer healing times and carry a greater risk of complications.
Where Are the Real Gaps in The Evidence?
Although these improvement rates are encouraging, laser resurfacing should not be considered a permanent cure for acne scarring. Reviews of the evidence have emphasised the variability between studies. Differences in the scar grading systems used, treatment settings, follow-up periods, and how outcomes are measured make direct comparisons difficult. Most studies report only short- to medium-term results, and there are no high-quality controlled trials. This makes it very challenging to differentiate the extent of improvement attributable to the laser from that due to natural collagen remodelling over time.
Recovery, Risk, And What the Trade-Off Looks Like in Practice
Visible healing time can be up to one to three weeks for ablative CO₂ resurfacing, and a few days for fractional non-ablative treatments. A comparison of the two found that CO₂ lasers provided greater improvement in scarring but longer recovery periods and a higher risk of complications than Er systems. Transient redness, swelling, and post-inflammatory hyperpigmentation, which typically resolve within several weeks, are the adverse effects most frequently reported in all laser categories. These effects occur in patients with darker skin tones at significantly higher rates.
The candid truth for patients who are considering laser resurfacing for acne scars is that the evidence shows real improvement in a wide range of scar types, with more robust results for the modalities that require more from the patient in terms of recovery. The 30% to 70% range of improvement is not an approximation but a true variation based on scar depth, skin type, treatment intensity, and the consistency of aftercare. A skin clinic that crafts a treatment plan around those variables as opposed to a standard protocol is operating within the evidence, not in spite of it.
