Psoriasis, also known as psoriasis. It is a common chronic skin disease. It manifests as erythematous plaques on the scalp and trunk and extremities with surface peeling. It may be accompanied by pruritus. There are four main types: common, arthritic, pustular and erythrodermic. For treatment, first of all, patients should have confidence that although this disease cannot be guaranteed to be cured, it can certainly be treated and recurrence reduced. In mild cases, topical creams are used, including Moelf, Darex and salicylic acid ointment. For the scalp area, Darex rub is generally used. The face is usually treated with Moeve or Putnam. On the trunk and extremities, if the lesions are very bright red, use only white petroleum jelly, or Moeve, not Darex, which can irritate the lesions. If the lesions are old and hypertrophic, use Darex ointment. For patients with relatively large lesions, phototherapy (PUVA or NB-UVB) may be used. In severe cases, where large plaques are generalized all over the body, or in erythrodermic or pustular psoriasis, oral medications, including Avastin and Radix polygoni, are required (all these drugs should be tested for liver function and blood lipids and blood routine before use, so do not use them casually), together with topical creams. The treatment plan differs with different skin lesions. Patients with arthritic psoriasis used to be treated with methotrexate. In recent years, biological agents have been widely used with obvious effects. Commonly used ones include Ixepro, Classic, etc. These drugs have certain side effects, and before using them, tuberculosis and other infections should be thoroughly excluded. On relapse prevention, the first step is to avoid upper respiratory tract infections. Inflammation of the tonsils can trigger psoriasis or lead to significant relapses. Take care to quit smoking. Second, many patients suffer from mood ups and downs that lead to recurrence of skin lesions. Tension, depression, and stress can lead to recurrence. Third, pay attention to a light diet and eat less chili, seafood and wine when the skin lesions are severe, not that you can’t eat any meat. It depends on the specific situation of the patient. It is recommended not to eat too many kinds of things at each meal, which is not conducive to finding triggers when a recurrence occurs. If the skin lesion worsens after eating a certain food, be careful to eat less of that food in the future. It is important to lead a regular life and avoid staying up late. In terms of genetic problems, 70% of patients are disseminated cases, that is, there are no patients with similar diseases in their families. There is a family history in 30% of patients.