Neurodermatitis itself does not cause Alzheimer’s and Parkinson’s, but whether a person with neurodermatitis will have both Alzheimer’s and Parkinson’s in combination or secondary to the disease is uncertain and depends on the patient’s own physical state. Neurodermatitis, also known as chronic lichen simplex, is a chronic skin disease characterized by itching and mossiness, with the main lesions in the peripheral skin. In contrast, Alzheimer’s and Parkinson’s are degenerative diseases of the central nervous system, with the main lesions in the brain. There is no correlation between neurodermatitis and the development of Alzheimer’s and Parkinson’s. The cause of Alzheimer’s and Parkinson’s disease is unclear, and there may be a correlation with genetics, age, environment, and lifestyle such as heavy metal poisoning, smoking, and alcoholism, and there is no correlation with neurodermatitis. Whether dementia and Parkinson’s disease will eventually occur in neurodermatitis patients depends on the patient’s own physical condition and other relevant factors. It is recommended that patients should seek prompt medical attention and standardized treatment under the guidance of a physician if they are unwell.