Efficacy and safety of Xiaofeng powder (xiao feng san) in treating urticaria: A protocol for a systematic review and meta-analysis of randomized controlled trials

Background: Urticaria is a common skin disease that has a high impact on a patient's daily life. Xiaofeng powder (XFP) is one of the most commonly used Chinese herbal formula in China for urticaria. However, due to the lack of systematic evaluations, its clinical efficacy remains controversial. This meta-analysis was performed to evaluate the effect and safety of XFP for urticaria.