Psoriasis is not an infectious disease, but it has a certain degree of heritability. It is clinically observed that some patients with psoriasis have a familial history of the disease, and some families have a significant genetic predisposition, with a family history currently accounting for about 30%. Psoriasis is a chronic recurrent inflammatory skin disease, mainly related to genetic, immune, environmental and infection factors, is a multi-gene genetic disease, mainly manifested as erythema and scaling of the skin, each person’s condition also varies in severity, and many conditions have delayed and unhealed. Mild psoriasis generally requires only topical medication, while severe types of psoriasis usually require systematic medication. It is recommended that when you have psoriasis, you should choose a regular hospital for medication, because improper treatment may aggravate the condition or induce pustular or erythrodermic psoriasis.