If you want to determine whether it is psoriasis or neurodermatitis, you can identify it by the cause of the disease and clinical symptoms. 1. Different causes: the cause of psoriasis is not yet completely clear, and it is considered to be related to the interaction of genetic and environmental factors. Neurodermatitis may be caused by local irritation, neuropsychiatric factors, gastrointestinal dysfunction, etc. Scratching and chronic friction may be the main triggers or aggravating factors. 2. Different clinical symptoms: psoriasis is mainly manifested as local red papules and plaques covered with silver-white scales, usually accompanied by obvious itching, which occurs on the extensor side of the limbs (especially elbows and knees) and the sacrococcygeal area. Neurodermatitis mainly occurs in the neck, elbow extension, lumbosacral and other easy to scratch parts, the basic lesions for the needle tip to the size of rice grains of polygonal flat papules, lesions can gradually fusion and expansion, the formation of moss-like changes. Itchy skin, erythema, papules, plaques and other manifestations, it is recommended to go to the dermatology department of the hospital in a timely manner for examination and treatment under the guidance of the doctor, to avoid delays in the condition.