Comparison of fractional, nonablative, 1550-nm laser and 595-nm pulsed dye laser for the treatment of facial erythema resulting from acne: A split-face, evaluator-blinded, randomized pilot study

Postinflammatory erythema is commonly seen in patients with inflammatory acne. There are no reliable treatment guidelines for acne erythema.We compared the effect and safety of a nonablative, 1550-nm fractional laser and a 595-nm pulsed dye laser (PDL) for the treatment of acne erythema.Twelve Korean patients with acne erythema were enrolled. Sides of the face were randomized to receive treatment with a fractional laser or a PDL for a total of three treatments at 4-week intervals. The assessment of effectiveness was mean change in mexameter scores, investigator's and patients' clinical assessments.Statistically significant improvements in baseline acne erythema were observed through an improved erythema index on both treated sides. But, the improvements from each laser treatment were not significantly different. Mean scores of investigator assessments were 3.42 ± 0.67 in fractional laser-treated sites and 3.33 ± 0.65 in PDL-treated sites. Patients assessed their improvement as good or excellent in 91.7% of fractional laser-treated sites and 75% of PDL-treated sites.Both lasers are effective and safe modalities for the treatment of acne erythema; however, these data suggest better clinical efficacy with the use of a 1550-nm, erbium-glass fractional laser.