New Research: Fractional Laser Resurfacing May Reverse Skin's Epigenetic Aging Signature

A new study in Nature's Scientific Reports adds a molecular layer to something dermatologists have observed clinically for years: fractional laser treatment doesn't just resurface skin, it appears to reset how skin cells regulate their own aging genes. Using a split-face design and next-generation methylation sequencing, researchers tracked DNA-level changes in treated versus untreated skin over nine months — and found the shifts were durable, specific, and correlated with visible clinical improvement. For anyone comparing resurfacing options, the findings offer a sharper answer to a question patients ask often: does this actually change my skin, or just its appearance?

What This Study Actually Measured

The research team, led by Dr. Konika Patel Schallen, enrolled 22 adults ages 20 to 64 with Fitzpatrick skin types II through IV. Each participant received three treatments with a 1940-nm non-ablative fractional laser, spaced 28 days apart, with only one side of the face treated and the other left as an internal, untreated control — a design that isolates the laser's effect from variables like diet, sun exposure, and genetics that make between-subject skin studies notoriously noisy.

At baseline and at one, three, and six months post-treatment, researchers biopsied skin and ran enzymatic methyl-sequencing across roughly 3.8 million CpG sites — the DNA locations where methylation, a chemical modification that turns genes up or down without altering the underlying sequence, tends to occur. That molecular data was paired with quantitative VISIA imaging and clinician-graded aesthetic scores.

The Findings: Methylation Shifts and Clinical Correlates

By one month after the final session, 635 differentially methylated regions had emerged in treated skin, expanding through month three before stabilizing by month six — a timeline consistent with known dermal remodeling and collagen turnover after laser injury. The more striking finding: at 83.9% of the CpG sites most strongly associated with chronological skin aging, treatment shifted methylation in the direction opposite normal age-related drift. In plain terms, the laser nudged the skin's molecular aging markers toward a younger-looking pattern — not just visually, but at the level of gene regulation.

The affected genes included FGFR3, HOXB4, and UBE2I, all tied to keratinocyte differentiation and basal-layer regeneration. Clinically, brown-spot counts on treated sides dropped by a median of 38% at one month (p<0.001) and remained 21% below baseline at three months (p<0.01), significantly outperforming the untreated control side in the same patients.

• 22 adults completed the study, using a split-face design with an untreated internal control

• 1940-nm non-ablative fractional laser, three sessions spaced 28 days apart

• Roughly 3.8 million CpG sites profiled via enzymatic methyl-sequencing

• 635 differentially methylated regions identified by 1 month, expanding through 3 months, stabilizing by 6 months

• 83.9% of aging-associated CpG sites shifted opposite to normal age-related drift

• Brown-spot reduction: -38% at 1 month (p<0.001), -21% at 3 months (p<0.01)

• Only 10 of 22 participants completed the optional 6-month follow-up visit

Why Epigenetic Data Matters Beyond Skin Texture

Cosmetic improvement after laser resurfacing is well documented — patients can see it in the mirror. What's newer is evidence that the mechanism behind it operates at the level of gene regulation, not just wound healing and collagen synthesis. The authors were careful to frame the results as correlational, not causal: as Dr. Schallen put it, this is an early study, and the team has not proven any link to skin cancer prevention, even though several affected genes are implicated in keratinocyte biology more broadly. The modest cohort size — and the fact that only 10 of 22 participants completed the six-month visit — means these findings need replication in larger studies before anyone draws firm conclusions about long-term disease risk.

Where This Fits With Ablative CO2 Resurfacing

Worth noting: the laser in this study was non-ablative — it creates microscopic treatment zones without removing the skin's surface layer, a gentler category than the ablative CO2 lasers used for resurfacing at Cor.e Laser Studio. CO2 resurfacing works by a related but more aggressive mechanism, vaporizing thin layers of damaged skin outright to trigger a deeper regenerative response in a single session that non-ablative devices typically need several sessions to approach. This study doesn't include ablative CO2 data, but it adds to growing evidence that fractional resurfacing, broadly, drives change at a molecular level and not just a superficial one.

Common Questions

Does this study mean laser resurfacing prevents skin cancer? No. The researchers were explicit that this is early, correlational data. Several affected genes are tied to keratinocyte biology broadly, but the study wasn't designed to test skin cancer outcomes, and no such claim should be drawn from it yet.

Was CO2 laser used in this research? No — this study used a 1940-nm non-ablative fractional laser, a different device category than the ablative CO2 lasers used for skin resurfacing at Cor.e. The findings are still useful context for anyone researching fractional laser technology generally.

How long do the changes from laser resurfacing typically last? In this study, methylation changes were still evident at six months, the longest point measured. Clinical results from any resurfacing laser also depend on ongoing sun protection, since UV exposure drives the same aging-associated changes in the opposite direction.

What does a “split-face design” mean, and why does it matter? One side of a participant's face is treated while the other serves as an internal, untreated control, letting researchers isolate the laser's effect from other factors that influence skin over time. It's considered a strong design for this kind of research.

Cor.e Laser Studio offers CO2 laser resurfacing and IPL — we don't perform non-ablative fractional treatments like the one in this study, and we're not in a position to promise molecular or cancer-prevention outcomes based on early research like this. What we can say is that texture, tone, and sun damage respond well to the resurfacing tools we do offer. If that's what you're weighing, a free consultation is the best way to find out whether CO2 or IPL fits your skin and your goals.