Daily Cosmetic Research Analysis
Analyzed 31 papers and selected 3 impactful papers.
Summary
Three studies advance aesthetic dermatology: a randomized split-face multicenter trial shows that combining long-pulse 1064 nm Nd:YAG with picosecond 755 nm alexandrite (diffractive lens array) enhances photoaging outcomes versus Nd:YAG alone; mechanistic human biopsy data demonstrate long-term ECM remodeling after Synchronous Parallel Ultrasound; and an evaluator-blinded split-face RCT finds no added benefit of combining picosecond alexandrite with RF microneedling for acne scars, despite improvements with both.
Research Themes
- Energy-based skin rejuvenation mechanisms and durability
- Optimization of combination laser protocols for photoaging
- Evidence-based appraisal of device combinations for acne scarring
Selected Articles
1. Effect of the combination of long-pulse 1064 nm neodymium-doped yttrium aluminum garnet laser and picosecond 755 nm alexandrite laser with diffractive lens array on skin photoaging: a randomized, split-face multicenter clinical trial.
In a randomized split-face multicenter trial (n=22; 21 completed), adding picosecond 755 nm alexandrite (diffractive lens array) to full-face long-pulse 1064 nm Nd:YAG improved GAIS response at 3 and 6 months versus Nd:YAG alone. 3D volumetry showed greater improvement in nasolabial folds and suborbital areas, VISIA metrics for pigmentation/pores improved, and no adverse events occurred.
Impact: Provides prospective randomized evidence supporting a synergistic dual-wavelength strategy that targets structural and pigmentary photoaging components with objective imaging endpoints and favorable safety.
Clinical Implications: Clinicians may consider sequencing LP 1064 nm Nd:YAG with picosecond 755 nm (DLA) to enhance outcomes in photoaged faces, particularly for nasolabial folds and suborbital areas, without added safety risk.
Key Findings
- Combined LP1064 nm + P755 nm (DLA) improved GAIS at 3 and 6 months versus LP1064 nm alone (85.7% vs 66.7% at 3 months; 66.7% vs 57.1% at 6 months).
- 3D volumetric analysis showed more pronounced effects on nasolabial folds and suborbital regions with combination therapy.
- VISIA analysis demonstrated significant improvements in pigmentation and pore size at 1 and 3 months.
- No adverse events were observed on either side throughout the study.
Methodological Strengths
- Randomized split-face, multicenter, prospective design
- Objective imaging endpoints (3D volumetry, VISIA) with longitudinal follow-up
Limitations
- Small sample (n=22; 21 completed) limits precision and generalizability
- Follow-up limited to 6 months; durability beyond this period unknown
Future Directions: Larger, blinded RCTs with longer follow-up should optimize fluence, passes, and sequencing, and include patient-reported outcomes and cost-effectiveness.
To evaluate the efficacy and safety of the combination of the long-pulse 1064 nm neodymium-doped yttrium aluminum garnet (LP1064 nm) laser and picosecond 755 nm alexandrite (P755 nm) laser with a diffractive lens array (DLA) in improving skin photoaging. This prospective, randomized, split-face trial was conducted between April 2024 and February 2025 at two centers. A total of 22 healthy volunteers with facial photoaging symptoms aged 30-65 years were enrolled. The full face was treated with the LP1064 nm laser, and one side was treated with the P755 nm laser with DLA for three sessions at 1-month intervals. Efficacy and safety were assessed before each treatment and 1, 3, and 6 months after treatment. The primary outcome was the Global Aesthetic Improvement Scale (GAIS) score. A total of 21 patients completed the study. The combined treatment side demonstrated further improvement in GAIS scores compared with the monotherapy side at 3 (85.7% vs. 66.7%) and 6 months (66.7% vs. 57.1%). Significant changes in the facial regions were observed. Volumetric analysis using 3D assessment revealed that the combined treatment had a more pronounced effect on the nasolabial folds and suborbital areas. VISIA analysis found significantly improved pigmentation and pore size at 1 and 3 months after treatment. No adverse events were observed on either side during or after treatment period. The combination of the LP1064 nm and P755 nm lasers with DLA can enhance skin rejuvenation by addressing the structural and pigmentary aspects of photoaging. These preliminary findings support the safety and efficacy of this combination approach. Further studies are needed to optimize this approach.
2. Synchronous Parallel Ultrasound Induces Long-Term Extracellular Matrix Remodeling of Human Skin.
Using a porcine model and longitudinal human biopsies up to 10 months, Synchronous Parallel Ultrasound caused dermis-confined thermal injury followed by sustained neocollagenesis, neoelastogenesis, and increased GAGs with parallel fiber realignment. Histology across multiple stains supports long-term dermal remodeling after treatment.
Impact: Provides rare longitudinal histologic evidence in humans for durable ECM remodeling after a specific ultrasound modality, clarifying mechanism and supporting treatment durability claims.
Clinical Implications: Supports counseling that ultrasound-based skin tightening can drive months-long dermal remodeling; may inform treatment intervals and expectations. Mechanistic biomarkers (collagen, elastin, GAGs) can guide protocol optimization.
Key Findings
- Thermal injury was restricted to the dermis in a porcine model.
- Human biopsies showed gradual increases in collagen and elastin with parallel fiber reorganization up to 10 months.
- Glycosaminoglycans were increased at all time points, indicating sustained fibroblast activity.
- Multiple histologic stains (H&E, Masson’s Trichrome, VVG, Unna Taenzer, Alcian Blue) corroborated ECM remodeling.
Methodological Strengths
- Integrated animal model for acute effects and human longitudinal biopsies for durability
- Comprehensive histologic staining capturing multiple ECM components
Limitations
- Sample size and subject characteristics not specified in the abstract
- Lack of randomized control; primarily histologic endpoints without clinical scales
Future Directions: Controlled clinical trials linking histologic remodeling to blinded aesthetic outcomes and quantifying durability; dose–response studies to optimize ultrasound parameters.
BACKGROUND: Energy-based interventions improve signs of skin aging by inducing controlled thermal injury and activating regenerative wound healing pathways. OBJECTIVE: This study investigates the underlying mechanism of acute and long-term extracellular matrix (ECM) remodeling induced by Synchronous Parallel Ultrasound technology leading to skin regeneration. METHODS/MATERIALS: An in vivo porcine model was used to investigate the acute thermal injury. In vivo human skin biopsies were obtained from subjects at baseline and at 1, 4, 7, and 10 months post-treatment. Histological evaluation was performed using Hematoxylin and Eosin, Masson's Trichome, Verhoeff-Van Gieson, Unna Taenzer, and Alcian Blue stains to assess changes in ECM protein expression. RESULTS: Thermal injury was restricted to the dermal layer. Histological analysis revealed a gradual increase in connective tissue collagen and elastin with unique reorganization and parallel realignment of the dermal fibers. Increased expression of glycosaminoglycans (GAGs) was also observed, indicating sustained fibroblast activity and matrix regeneration across all time points. CONCLUSION: These findings provide histological evidence of continuing and long-lasting dermal remodeling after Synchronous Parallel Ultrasound treatment, characterized by neocollagenesis, neoelastogenesis, and GAGs production. The study supports the efficacy of Synchronous Parallel Ultrasound in the long-term induction of skin regeneration.
3. Evaluating the Picosecond 755-nm Alexandrite Laser With Diffractive Lens Array and Radiofrequency Microneedling for the Treatment of Atrophic Acne Scarring.
In an evaluator-blinded split-face RCT (n=20), adding picosecond 755 nm alexandrite (DLA) to RF microneedling did not outperform RF microneedling alone on blinded ECCA, PGAIS, or SGAIS at interval time points. Both modalities improved acne scars over time and were well tolerated.
Impact: Delivers a well-controlled negative finding that challenges assumptions about synergy between picosecond alexandrite and RF microneedling for acne scars, informing cost-effective treatment planning.
Clinical Implications: RF microneedling alone may suffice for many patients with atrophic acne scars; routine addition of picosecond alexandrite (DLA) may not provide incremental benefit despite added cost and time.
Key Findings
- Evaluator-blinded, split-face RCT (n=20) showed no significant difference between RF microneedling alone and combination with picosecond alexandrite on ECCA, PGAIS, and SGAIS.
- Both treatment sides showed significant improvements over time across investigator- and subject-rated scales.
- Four treatment sessions at 4-week intervals were well tolerated with a favorable safety profile.
Methodological Strengths
- Evaluator-blinded, randomized split-face design reducing inter-individual variability
- Use of validated scar scales (ECCA, PGAIS, SGAIS) over multiple time points
Limitations
- Small sample size (n=20) limits power to detect modest synergy
- Single-center design; histologic correlates and long-term durability not reported
Future Directions: Larger multi-center RCTs with longer follow-up, standardized energy parameters, and responder analyses to identify subgroups that may benefit from combination therapy.
BACKGROUND: Acne scarring can impact patients negatively psychosocially. Picosecond lasers and radiofrequency microneedling may be used to improve this condition. OBJECTIVE: To evaluate the efficacy and safety of combination treatment with a picosecond 755-nm Alexandrite laser (PSAL; Picosure Pro; Cynosure, Westford, MA) with diffractive lens array and a radiofrequency microneedling device (RFM; Potenza; Cynosure) for treating facial atrophic acne scars. METHODS: This was a prospective, single-center, evaluator-blinded, split-face, randomized clinical trial. Twenty subjects with moderate to severe atrophic facial acne scarring were randomized to have one facial half treatment with PSAL followed by full-face treatment with RFM. Subjects received 4 treatments at 4-week intervals. RESULTS: The blinded Investigator's échelle d'évaluation clinique des cicatrices d'acné (ECCA) acne grading, Physician Global Aesthetic Improvement Scale (PGAIS), and Subject Global Aesthetic Improvement Scale (SGAIS) did not show a significant difference between the facial half treated with RFM only and the half treated with RFM and PSAL at interval time points. However, there was significant improvement in ECCA, PGAIS, and SGAIS for both groups over study duration. CONCLUSION: Both RFM and PSAL appear safe and may be effective for acne scarring treatment, but larger trials are required to confirm superiority or synergy.