For neurodermatitis, there is usually no need to check for allergens. The professional name for neurodermatitis is chronic lichen simplex, and its cause is closely related to psychoneurological factors. Excessive scratching and chronic friction are also triggering factors for neurodermatitis. It is usually not related to allergens, so there is no need to check for allergens. The diagnosis of neurodermatitis is mainly based on the typical clinical manifestations, and if necessary, improve the pathological examination. In addition, gastrointestinal dysfunction, endocrine changes can also trigger this disease, if necessary, can improve the relevant examination. Neurodermatitis should be treated promptly, combined with their own actual situation, under the guidance of the doctor to remove the causes and stop itching treatment.