Psoriasis is psoriasis, a chronic inflammatory disease with an unclear specific cause. There are four clinical types of psoriasis, each with different symptomatology: i. Psoriasis vulgaris, the most common type, manifests as red patches of varying size on the surface of the skin with silvery white scales on the surface of the red patches, which can be scraped away to see the film phenomenon and punctate bleeding; ii. Pustular psoriasis, in which large red patches appear on the surface of the body and clusters of superficial sterile Some patients can also be limited to the palms of their hands and feet; third, erythrodermic psoriasis, manifesting as diffuse flushing, swelling and desquamation of the whole body; fourth, arthritic psoriasis, with the manifestation of common psoriasis on the skin surface, accompanied by arthropathy, any joint can be involved, manifesting as joint swelling and pain, restricted movement, and joint deformity in severe cases.