The difference between parapsoriasis and pityriasis rosea includes clinical symptoms, treatment methods and prognosis. 1. Clinical symptoms: psoriasis is similar to psoriasis, mainly scaly erythema, and there may be no obvious self-conscious symptoms. Psoriasis is mainly characterized by rose-colored patches of furfuraceous scales, with or without itching. 2. Treatment: There is no specific treatment for psoriasis, but medication can be used to relieve symptoms, such as topical glucocorticoid ointment, tacrolimus cream and so on. Psoriasis is self-limiting and can be treated symptomatically with medication. If the itching is severe, antihistamines such as ebastine and loratadine can be used. 3. Prognosis: most of the psoriasis has a slow course and is difficult to be cured completely. Psoriasis is a self-limiting disease, can be cured by itself, and generally will not recur after healing. The above is part of the difference between the two diseases, specific differential diagnosis is recommended by a professional doctor.