• Mohammad Radmanesh, Samira Mehramiri, and Ramin Radmanesh.
• Dr Radmanesh Dermatologic and Laser Center, Tehran, Iran.
• J Dermatolog Treat. 2019 Nov 25: 1-4.

AbstractBackground: Both pulsed dye laser (PDL) and fractional CO2 laser (FCO2L) are used commonly for the treatment of hypertrophic scars.Objective: To compare the efficacy of PDL and FCO2L on hypertrophic scars.Patients and methods: One part of each scar, or one of the two similar scars in 35 patients was treated with PDL and the other parts, or scars were treated with FCO2L. The parameters used for FCO2L were: power = 30 W, pulse energy = 50 mJ, density = 200 spots/cm2. The parameters used for 585 nm PDL were 9 J/cm2 with 5 mm spot size. The FCO2L side was treated for three passes to debulk the scar. The coagulated tissue was wiped out before the next pass. The PDL side was treated with two superimposed passes. The procedures were repeated every month for 4 months.Results: After four sessions of laser therapy, both sides showed remarkable improvement but no meaningful difference was detected between two areas that were treated with PDL and FCO2Ls (p > .05). The mean Vancouver Scar Scale was 7.31 ± 1.93 in the beginning and 4.26 ± 1.48 for FCO2L and 4.33 ± 1.70 for PDL one months after the final session.Conclusions: Both PDL and FCO2Ls were equally effective on hypertrophic scars.

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