Psoriasis is medically known as psoriasis, which is mainly categorized into common type, arthropathic type, pustular type and erythrodermic type psoriasis. 1. Ordinary type psoriasis; accounting for 90% of psoriasis, it is the most common type in clinic, which mainly manifests as round and oval skin lesions and gradually expands into plaques. The skin lesions are easy to occur in knee joints, elbow joints and trunk. They are mainly characterized by erythema, papules, and plaques covered with loose, silvery-white scales. When the film is scraped off, small bleeding spots can be seen. 2. Arthropathic psoriasis: when psoriasis progresses to a certain stage, it will be accompanied by joint symptoms, which can occur in any joints of the whole body, and is often manifested as asymmetric abnormal changes in distal joints of the fingers, swelling of soft tissues, and the formation of sausage fingers. 3. Pustular psoriasis: mostly induced by improper treatment of common psoriasis, it is a serious type of psoriasis, usually on the basis of erythema, aseptic pustules appear, and the severity of the disease varies. 4. Erythrodermic psoriasis: usually developed from other types of psoriasis, the symptoms can involve the whole body, resulting in inflammation of the whole body skin, redness, skin peeling with itching, pain, fever, lymph node enlargement and other symptoms. With the above symptoms, it is recommended to go to the dermatology department of the hospital for a clear diagnosis and standardized treatment as prescribed by the doctor.