Eczema is a very common clinical disease, especially in dermatology is most common, eczema is divided into many types, of which does not itch eczema is a common type of eczema. There are many reasons that cause non-itchy eczema, and the main ones that are common in life are the following: 1. Diseases of the internal system can cause eczema. Especially chronic internal diseases, such as chronic gastroenteritis, gynecological diseases, hyperthyroidism and so on, long-term chronic diseases can cause eczema throughout the body. 2, genetics has a certain relationship, many patients with eczema have a certain family history of heredity. 3, contact allergies lead to contact allergens, such as pollen, dust and so on, will not itchy eczema. 4, sympathetic nerve excitement, many of the Patients due to prolonged late nights, mental stress, there may be a certain place dermatitis, flaking, not accompanied by itching.