Psoriasis is characterized by the appearance of papules of varying sizes, erythematous plaques covered with silvery-white scales, and well-defined borders, most often on the scalp, extensor surfaces of the extremities, and the back. It is more common in men than in women. With this disease, the patient’s appearance is greatly damaged. It is not conducive to normal work and life. The clinical symptoms of psoriasis are diverse and vary widely from patient to patient, and the diagnostic criteria, treatment principles, and prognosis of the disease vary greatly. To facilitate the description and differentiation of different conditions, the dermatological community has divided psoriasis into four main types: (1) Psoriasis vulgaris: This is the most common type, accounting for more than 97% of all psoriasis patients. The lesions vary in size and shape and can involve any part of the skin and mucous membranes such as the mouth and genitals, but are more common on the scalp, trunk, and extremities. (2) Pustular psoriasis: this type is rare, there are two major types of limited and generalized type, the incidence of about 0. 69%. It is characterized by the occurrence of sterile pustules at the lesion site, itching or pain, and may be accompanied by the lesions of common psoriasis. (3) Arthritic psoriasis: This type also has an incidence of about 0.69% and has a psoriatic rash with joint symptoms cool like rheumatoid arthritis. The joint damage usually occurs within a certain period of time after the appearance of the psoriatic rash, or it may occur at the same time as the rash, and a few patients may have arthritic symptoms before the appearance of the rash. (4) Erythrodermic psoriasis: It is also rare and accounts for about 1% of all psoriasis cases. It is characterized by inflammation, flushing, and swelling of the skin all over the body on top of psoriasis and is an acute, severe type of psoriasis. Erythrodermic psoriasis can be transformed from other types due to improper treatment, or erythrodermia can occur at the beginning.