Self-applied topical interventions for melasma: a systematic review and meta-analysis of data from randomized, investigator-blinded clinical trials

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Abstract

Our findings indicate that TCC and its individual components HQ and tretinoin are effective in lightening melasma. Besides these established self-applied treatment options, we identified further medical treatments as well as promising cosmetic and herbal product treatment approaches. Furthermore, evidence suggests that using broad-spectrum sunscreen covering both the visible and ultraviolet-light spectrum enhances the treatment efficacy of HQ. However, with mostly small RCTs comparing treatments directly using a broad range of outcomes, further research is needed to draw conclusions about which treatment is most effective. What is already known about this topic? Melasma is a common dermatological disease. Although it is primarily a cosmetic condition, it can severely affect the patient's wellbeing and quality of life. Treatment options for melasma include a broad range of medical, cosmetic and herbal products. Given the large number of available interventions, it is difficult for clinicians and for patients to make informed decisions about which treatment to choose. What does this study add? We systematically assessed data from investigator-blinded randomized controlled trials of self-applied topical interventions. Our GRADE evaluations of confidence in the findings ranged from very low to high and may help clinicians and patients navigate treatment decisions. Besides the established self-applied medical treatment options, we identified promising cosmetic and herbal treatment approaches. Evidence suggests sunscreen covering the ultraviolet (UV)- and visible light spectra increases treatment efficacy compared with UV-only protection.

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