In recent months, I have been in the ward, and several psoriasis patients in succession have been suffering from arsenic poisoning and reduced platelets due to the application of prescriptions. I would like to remind all patients that they must go to regular hospitals to treat their illnesses and be cautious in taking medication. Many prescriptions were collected during the Cultural Revolution, then abandoned by regular hospitals because of the toxic side effects, and fell into the folklore, patients are anxious to seek medical help, some methods have short-term curative effect, but have long-term harm, please do not use. Some patients purchase drugs from the Internet, which is highly disapproved of. When using finished drugs, be sure to recognize the “State Drug Certificate” and use the drugs under the guidance of a doctor, not under the lure of a drug seller. Psoriasis can’t be eradicated once and for all, but it can be controlled by regular treatment, so please treat patients rationally and get well soon.