Perianal eczema is a common non-infectious skin disease of the anus (some people believe that perianal eczema is contagious, which is not true), characterized by irregular rash, exudation of secretions, itching and easy recurrence, and can develop at any age. I. What causes perianal eczema? The causes of perianal eczema are complex, with the interaction of intrinsic and extrinsic factors, often multifaceted (there is no way around it, the world is so complex). The internal causes of eczema are induced by focal infections, allergenic foods and medications or contact with certain allergenic items and digestive disorders; there are also specific external stimuli and infections of substances that can also trigger perianal eczema, such as sunlight, ultraviolet rays, climatic conditions, etc. Second, what is the performance of perianal eczema? 1, itching Itching is the main symptom of anal eczema, generally paroxysmal itching, scratching the local, can make the skin broken and increased pain and itching. When the itching is unbearable, it can affect learning, work and sleep. 2.Anal flushing The perianal skin or skin folds are light pink and edematous due to wetness, friction or scratching. 3.Anal wetness Exudation can cause anal wetness and discomfort, underwear contamination and skin abrasion. 4.Pain The skin around the anus can be broken due to scratching, which can lead to chapping and infection, and anal pain and pain during defecation often occur. 5.Other The biggest danger of perianal eczema is that it can cause serious complications, such as indigestion, bloating, constipation, diarrhea, headache, insomnia and irritability.