Laser-Based Treatments for Skin Scarring

Laser-based therapies for skin scarring harness targeted light energy to remodel dermal tissue and improve scar appearance. Fractional ablative lasers create microscopic zones of thermal injury within the epidermis and dermis, stimulating collagen remodelling and enhancing skin texture. Non-ablative approaches deliver energy more superficially, preserving the epidermis while promoting neocollagenesis in the deeper layers. Recent advances include picosecond-domain pulses, which rely on laser-induced optical breakdown to generate intradermal microcavities without overt thermal damage, and the use of diffractive optics or microlens arrays to fractionate beams and achieve more uniform tissue response. Clinicians tailor wavelength, pulse duration and fluence to scar type—atrophic, hypertrophic or keloidal—to balance efficacy, safety and downtime. Optimisation of treatment parameters has expanded global access to laser therapies for acne scars, striae distensae and surgical scarring, offering reproducible outcomes and minimal adverse effects when protocols are rigorously applied.

Research from Nature Portfolio

Recent studies have investigated picosecond-domain laser interactions with pigmented tissue to refine scar-treatment parameters. One key work examined flat-top and fractionated beam delivery at 532 nm and 1,064 nm on ex vivo pigmented skin. Variations in fluence produced graded vacuolation of keratinocytes and melanocytes, and microlens array fractionation yielded evenly spaced microzones of dermal disruption. These findings clarify how wavelength, beam profile and energy density influence tissue selectivity and microinjury patterns, informing protocols that maximise collagen remodelling while reducing epidermal damage and post-treatment recovery time.

Laser-Based Treatments for Skin Scarring publication trend

The graph below shows the total number of articles in laser-based treatments for skin scarring across all publications each year (not limited to Nature Index journals).

Technical terms

Fractional laser: A laser modality that creates microscopic thermal columns in skin, leaving intervening areas intact to accelerate healing.

Ablative vs non-ablative: Ablative lasers remove the epidermal surface, while non-ablative lasers penetrate without surface ablation, stimulating deeper collagen synthesis.

Laser-induced optical breakdown (LIOB): A photomechanical process in which ultrashort laser pulses generate plasma and cavitation in tissue, producing microscopic lesions.

Microlens array (MLA): An optical component that divides a laser beam into multiple micro-beams for fractionated delivery.

Diffractive optical element (DOE): A patterned optical device that spatially splits and shapes laser beams to achieve uniform energy distribution.

References

1. Pattern analysis of 532- and 1,064-nm picosecond-domain laser-induced immediate tissue reactions in ex vivo pigmented micropig skin. Scientific Reports (2019).
2. Laser-induced optical breakdown effects of micro-lens arrays and diffractive optical elements on ex vivo porcine skin after 1064 nm picosecond laser irradiation.. Biomedical Optics Express (2020).
3. In vivo multiphoton‐microscopy of picosecond‐laser‐induced optical breakdown in human skin. Lasers in Surgery and Medicine (2017).
4. Efficacy of minimally invasive nonthermal laser-induced optical breakdown technology for skin rejuvenation. Lasers in Medical Science (2012).