Psoriasis is caused by a combination of decreased immunity, familial inheritance, recurrent inflammation of the tonsils, and some unknown comprehensive factors. This disease is not related to fungal infections. Once psoriasis appears, it is not easy to completely eradicate. For cases with milder symptoms, through treatment, the overall skin lesions can completely disappear, and they can remain in remission for a long time. If the symptoms are more severe, it is advised to seek formal treatment at a dermatology department in a regular hospital. Treatment options can include oral medication combined with topical treatments, along with narrowband ultraviolet light therapy. If conditions allow, treatment can also involve injections of biological agents. If the condition is more severe, manifesting as erythrodermic psoriasis or psoriatic arthritis, hospitalization is recommended. Regular exercise should be maintained to boost immunity.