Although psoriasis is a common skin disease, it is not easy to treat. Psoriasis is generally not contagious, so don’t worry about it. There is a strong relationship between psoriasis and family history. Psoriasis is a chronic recurrent skin disease that is not caused by infectious microorganisms, and studies have shown that couples who have lived together for more than 20 years are not infected. Doctors have done tests where psoriasis lesions were transplanted onto healthy skin and found that no psoriasis occurred, indicating that psoriasis is not contagious. Psoriasis is a systemic immune disease caused by many reasons such as physical quality, infection, cold, humidity, psychological environment, lesions, trauma and other pathological changes such as metabolic disorders and microcirculatory disorders, which cause abnormalities to occur due to the accumulation of toxins that the body should excrete in the skin. Psoriasis is not contagious, and although there is a certain hereditary factor, not all patients will have heredity, and some do not.