Psoriasis is a recurrent erythematous scaly disease with a psoriasis gene that runs in families. However, only 20 to 30 percent of patients have a clear family history, and most patients have no family history. Seasonal changes such as cold, trauma, infections such as tonsillitis, late nights, smoking, and stress can trigger and exacerbate psoriasis. Infectious diseases require an infectious source; psoriasis is an immune abnormal disease and has no infectious source. Close contact is not contagious. Contact between colleagues, friends, relatives and friends such as eating and shaking hands is not contagious. Many people are afraid to contact psoriasis patients when they see the red spots and scales on their bodies, and even resist psoriasis patients, which is incorrect. The erythema and scales of psoriasis patients are not contagious, and it is important to accept psoriasis patients and live peacefully with them. Various jobs should not discriminate against psoriasis patients either. Through clinical treatment, psoriasis patients can have their red spots fade away, and there is little difference between them and normal people. Chinese people have less general knowledge about the disease and should vigorously promote general health knowledge so that everyone knows and understands psoriasis.