Objective To explore the effect of Fengre Tang on passive skin allergy in rats and its anti-inflammatory and anti-itching effect. Methods Passive skin allergy model in rats was prepared to observe the effect of Fengre Tang on allergy. Inflammation models were used to observe the influence of xylene causing auricle tumefaction in rats, and earrageenan inducing paw edema in rats after taking Fengre Tang. Itching model was used to observe the influence of glucan-40 inducing pruritus in mice, and amino acid group causing itching in guinea pigs after taking Fengre Tang. Results Fengre Tang had anti...