Psoriasis is initially a red papule or macular rash that gradually expands or fuses into patches, bright red or crimson, higher than the skin, with distinct infiltration at the base and clear edges, surrounded by an inflammatory red halo, covered with multiple layers of grayish or silvery white scales, gently scraping away the surface scales, gradually revealing a light red shiny translucent film, scales, film, and blebs are important features for diagnosing psoriasis, accompanied by varying degrees of Itching. The rash is characterized by silvery-white scales, thin film phenomenon and punctate bleeding; ③ special pathological changes, chronic course, mostly light in summer and heavy in winter, recurrent episodes are easy to diagnose; ④ psoriatic nail changes (finger and toe) nails are thimble-like punctate depression, or loss of luster, deformation, hypertrophy, peeling, etc. The key to treating psoriasis is to find out the cause and treat it symptomatically. There are very many causative factors for psoriasis, and different therapies and methods are used depending on the cause, and there are many different types of psoriasis, different types, different causative factors, and different properties. The treatment of psoriasis must first be diagnosed and then a treatment plan must be developed before treatment is carried out.