Dermatitis eczema is a very common skin disease and an allergic disease. In life, many people have had eczema, and when it develops, it can be itchy and unbearable, which not only causes great damage to the patient’s skin, but also brings trouble to the patient’s life and work. However, many people do not know much about dermatitis eczema, so they do not know what to do when it develops. The following let me take you more detailed understanding of it. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The internal and external causes are interlinked. External causes such as chemicals, cosmetics, animal toxins, fish and shrimp, pollen, dust, sunlight, scratching, etc. For example, contact dermatitis, mostly caused by improper use of accessories, cosmetics, contact with pets, paint, building materials, etc.; internal factors include genetic factors, mental factors, immune factors of the body, metabolic factors, etc. 2, the symptoms of dermatitis eczema features (1) mossy lesions: the lesions of this disease are characterized by mossy skin, the lesion area skin moss-like changes, skin thickening, deepening skin lines, skin crest elevation, lesion area is dark brown, dry, with fine flaking, clear borders, the edge can have small scattered flat papules. (2) Pruritus: paroxysmal pruritus in the lesion area, especially at night, can affect sleep. (3) Preferred sites: limited neurodermatitis is more likely to occur on the neck, collar, knees, elbows, sacrum and other areas; disseminated neurodermatitis can be generalized throughout the body.