Comparison of red light and blue light therapies for mild‐to‐moderate acne vulgaris: A randomized controlled clinical study

Photodermatology, Photoimmunology and PhotomedicineLi J, Li J, Zhang L, et al. | January 24, 2022


Findings demonstrate similar efficacies of red light (RL) and blue light (BL) therapies in the treatment of mild-to-moderate acne vulgaris, especially for inflammatory lesions. RL was beneficial with fewer adverse reactions, relative to BL.

  • In this study, a total of 28 patients with mild-to-moderate acne vulgaris were randomized into the RL group or the BL group, to compare the efficacy and side effects of RL and BL for acne vulgaris as well as to evaluate these two therapies in different types of lesions.

  • In the RL group and in the BL group, the average improvement rate of total acne lesions was 36.2% and 30.7%, respectively, at the 2-week follow-up.

  • In the RL group, average improvement rate of inflammatory and non-inflammatory lesions was reported to be 51.5% and 17.3%, vs 26.4% and 10.0% in the BL group.

  • Treatment-associated adverse reactions were noted distinctly in the BL group.

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