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Two factors of oxidative stress and inflammatory processes are implicated in pathogenesis of acne vulgaris. Silymarin has antioxidant and anti‐inflammatory activities. This study was done to evaluate the effect of oral silymarin in the treatment of acne vulgaris compared to doxycycline and also their combination therapy. This randomized controlled trial was performed on 60 patients with acne vulgaris were divided into three groups of 20 patients, including: Silymarin (Group 1), Doxycycline (Group 2), and both compounds (Group 3). The patients' response was monitored every month and the lesions were evaluated using photography and two methods of Global Acne Grading system (GAGS) and Acne Severity Index (ASI). According to the results, the response to silymarin was not significantly different with doxycycline in the GAGS index (p = .260), but was lower in the ASI (p = .021). In this study, the synergistic effects …