Psoriasis is medically known as psoriasis, which is characterized by chronic, easily recurring, localized scaly red patches or plaques on the skin, and a well-defined rash. Psoriasis is an immune-related chronic relapsing inflammatory skin disease, which has a long course and is prone to relapse, and its causes may be related to genetics, trauma, infection, drugs and other factors. Clinical features include the appearance of papules, scales, erythema or plaques on the skin, which gradually expand into a well-demarcated rash with silvery-white scales on the surface. After scraping off the surface scales, a light red, translucent and reflective “film” may appear, which can be peeled off to reveal punctate hemorrhages. There are usually few other specific accompanying symptoms, such as pain, and patients may experience varying degrees of itching. For those who want to know more about the characteristics of psoriasis, it is recommended to consult a doctor at a regular hospital to clarify the relevant issues.