Anal eczema is a common perianal skin disease, which is a non-infectious inflammatory disorder, with lesions mostly limited to the anal opening and perianal skin, and in a few cases extending to the perineum. As the disease often appears anal dampness and itching, patients are often embarrassed, and some patients itch at night often make it difficult to sleep peacefully, seriously affecting work or study, causing a great psychological burden. So how exactly does anal eczema invade us? Chinese medicine: Chinese medicine recognized this disease very early, “dipping sores”, “rheumatic rash”, “naughty wet” and so on are different names for anal eczema in Chinese medicine. Chinese medicine believes that wind, dampness and heat can lead to attacks of the disease, while spleen deficiency and blood deficiency are also common causative factors. In the acute stage, it is believed that the acute stage is caused by the invasion of the skin by wind and heat or diet, dampness and heat, which is injected into the anus and stagnates in the skin; in the chronic stage, it is caused by repeated attacks, dampness and fire, depletion of blood and fluid, and blood deficiency. Modern medical understanding: 1, their own physical factors: manifested by the patient is too sensitive to internal or external pathogenic factors, in addition to eczema, but also prone to asthma, rhinitis, etc.. 2, allergic reactions: eczema mainly by complex internal and external pathogenic factors stimulated by allergic reactions, such as various proteins including fish, shrimp, crab, eggs, dyes, chemical fiber products, soap, etc. can induce the disease. 3, perianal diseases: such as repeated prolapse of internal hemorrhoids, rectal prolapse, epithelial defects of the anal canal, anal fistula, etc., due to the patient’s own tissue proteins in its body or body surface through a complex process, so that the patient’s skin autosensitive, resulting in eczema-like changes in the skin. 4, nutritional disorders, indigestion, gastrointestinal diseases: gastrointestinal dysfunction can cause mucosal secretion absorption malfunction, so that the specific protein into the body eczema occurs. 5, mental and neurological dysfunction: excessive fatigue, mental tension depression can cause or aggravate anal eczema, when the plant nervous disorders can also cause anal eczema. Regardless of which factors lead to eczema, in the treatment only to identify the cause, the right treatment to get cured.