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Although GP can clear within 3 to 4 months, up to 39% of cases may progress to chronic plaque psoriasis. Currently, there is a paucity of literature investigating the efficacy of different treatment modalities. This systematic review aims to synthesize all available data on GP treatment efficacy. A literature search was conducted using Medline, Embase, Web of Science, and CINAHL with no date limits. A total of 75 studies satisfied eligibility criteria and were analyzed. Most studies were case reports, series, or retrospective studies. Only 5 randomized controlled trials (RCTs) were identified. For topical treatments, corticosteroids and calcipotriol creams had the most evidence for efficacy. Four categories of systemic therapies were identified: traditional immunosuppressants, antibiotics, retinoids, and biologics. Evidence regarding antibiotic therapy suggests minimal connection between underlying infection resolution and GP lesion remission. Phototherapy had the most robust evidence, with narrowband ultraviolet B (UVB) being the most effective. Our findings are limited by high heterogeneity in study design and high risk of bias. Based on our review, we propose the following treatment algorithm. As first-line therapy, we recommend topical corticosteroids and calcipotriol cream, in combination with phototherapy. As supportive therapy, we recommend antibiotics if applicable. For second-line therapy, we recommend methotrexate or cyclosporine. For severe and refractory GP, biologics can be used as third-line treatment. 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