What is psoriasis? Psoriasis is a chronic disease and the purpose of treatment is not to eradicate the disease, but to properly control the disease and improve the quality of life of the patient. Therefore, adequate doctor-patient communication, mutual trust and cooperation are very important, which is an important guarantee of successful treatment. Psoriasis is mostly treated with comprehensive therapy, usually a combination of internal, external and ultraviolet therapies, and after the disease is controlled, the types of medication are gradually reduced, and finally one or two therapies are available for maintenance treatment. What are the clinical manifestations of psoriasis? 1, common psoriasis is the most common, accounting for about 95% of the entire psoriasis, the typical skin lesions are red macules, covered with silvery white scales on the surface, with clear borders. Gently scrape off the scales, a layer of light red shiny film can be seen, called the film phenomenon. In addition to psoriasis lesions, there are also arthritic lesions, mostly invading the distal interphalangeal joints, involving red, swollen and painful joints, which can gradually lead to joint deformity and fixation. Severe cases can invade multiple large and small joints and the spine, forming sacroiliac arthritis and ankylosing spondylitis 3, erythrodermic psoriasis erythrodermic psoriasis is a special and serious type of inflammation of psoriasis, the initial rash often occurs in the flexural side of the extremities or joint flexural surface limited erythema, quickly extended throughout the body, is widely flushed, and there is mild edema or infiltration. A large number of flakes, large flakes at the end of the extremities, such as gloves and sock-like. 4.Pustular psoriasis The palmoplantar pustular lesions occur in the palmoplantar, manifesting as pinhead to corn-sized sterile pustules on the basis of erythema; generalized pustular psoriasis, manifesting as a cluster of pinhead-sized sterile pustules on the skin of the whole body.