A Randomized controlled clinical trial for the Analogy choosed external Chinese medicine to treat the psoriasis indications

INTERVENTION: treatment group:External use the basis of the embellish ointment (angelica sinensis, radix arnebiae seu lithospermi), according to the classical theory of ancient books, the basis of the deployment of the prescription, literature review and the study basis of clinical research.The syndrome of blood heat, the skin is flush,;control group:Placebo ; CONDITION: psoriasis PRIMARY OUTCOME: Skin lesion area and severity index score (PASI); SECONDARY OUTCOME: Dermatology life quality score, SF‐36 Quality of Life Scale;The measure of skin barrier function;The major clinical syndromes of traditional Chinese medicine scoring index;auxiliary examination: Blood routine, urine routine, liver function, renal function, electrocardiogram (ecg);History of illness and treatment Onset, family history, history of treatment, and other diseases and treatmenthistory;allergic history: Drugs, food or contact allergy;TCM symptoms, tongue, pulse condition;vital signs: Body temperature, breathing, heart rate, blood pressure;Demographic indicators; INCLUSION CRITERIA: Inclusion criteria :Conform to the diagnostic criteria of psoriasis vulgaris with western medicine; Conform to the psoriasis standards of the blood heat syndrome, blood dryness syndrome and blood stasis syndrome; The age is ranging from 18 to 65 years old; The illness severity: the lesion degree is mild‐to‐moderate (20 >BSA >5). Sign in the informed consent, volunteer to recept the test, The informed consent process comply with the provisions of the GCP.