Inclusion Criteria:  18-65 years; Had a diagnosis of psoriasis vulgaris for ≥6 months; TCM syndrome evaluation belongs to blood-heat type patients: it is more common in the advanced stage of psoriasis. Symptoms: skin lesions develop faster, skin lesions are bright red, blood loss is obvious, scales are dry and thick, itching is severe; upset, and thirsty, dry stool; red-purple tongue, yellow fur, string or slippery or rapid pulse; Patients without serious primary diseases, such as cardiovascular, cerebrovascular, liver, kidney and hematopoietic system or mental illnesses; Those who are willing to cooperate and can persist in the treatment without interruption; During the treatment period, those who have not taken or used other psoriasis drugs externally.  Exclusion Criteria:  Patients with serious primary diseases, such as cardiovascular, cerebrovascular, liver, kidney and hematopoietic system or mental illnesses; History of immunosuppressant medication in the past three months; Those who use other drugs during treatment or stop treatment on their own and have incomplete observation data; Pregnancy or risk of pregnancy, and/or lactation; Aged ≤18 or ≥65 years old; Patients with other types of psoriasis, such as articular, pustular, and erythroderma.