Psoriasis can be divided into many types, each with a different treatment. Even for the same type of psoriasis, treatment varies depending on the severity of the disease. For example, psoriasis vulgaris can be divided into light (skin involvement of less than 2% of the total skin area, medium (skin involvement of 3-10% of the total skin area), and heavy (skin involvement of more than 10% of the total skin area) depending on the area of skin involvement. Generally, the area of one palm of an adult hand accounts for 1% of the total surface area, so we can deduce the area of the affected skin. Mild psoriasis of common type: it can be treated with simple topical medication based on psychological relaxation, more exercise, appropriate sun exposure and the use of moisturizers, and can be treated with topical glucocorticoids combined with vitamin D derivatives, combined with salicylic acid and other drugs; moderate psoriasis: ultraviolet light therapy can be added on top of this, and oral medication can also be used; severe psoriasis: systemic medication is often needed, such as oral retinoic acid, methotrexate, cyclosporine, and so on, and can also be treated with traditional Chinese medicine or biological agents. On the basis of the above treatment, individualized treatment of the patient should be considered. Some patients with small lesions, but with a large impact on work and life, may also be treated systematically. The treatment plan should be adjusted according to each individual’s physique.