Perianal eczema is a metaplastic disease confined to the skin around the anus. Clinically, it is often characterized by moist skin at the anus, skin infiltration and hypertrophy, increased local secretions, unbearable itching, and recurrent attacks. The treatment of perianal eczema should be based on the four points of dialectical treatment: wind, heat, dampness and blood. The basic formula consists of perianal eczema patients often start with anal itching or itching pain, which is easily ignored at first, or because of the special location, some patients are ashamed to talk about it and often delay treatment. At present, Western medicine mostly uses steroid hormone treatment, although it can achieve satisfactory anti-itch effect, but easy to cause skin atrophy, local hairy, capillary dilatation and other adverse reactions, therefore, Chinese medicine is gaining more and more attention, especially with anti-itch and dampness of Chinese medicine external washing treatment of perianal eczema is respected. The Chinese medicine formula for the treatment of perianal eczema consists of: Bai Xian Pi, Di Shen Zi, Serpentine, Bai Bu, Sheng Di Huang, Red Peony, Licorice, decocted and dried in a warm bath 2-3 times a day for 15-20 min each time. Based on the dialectical use of wind, heat, dampness and blood Clinically, wind, heat, dampness and blood also reflect the stage of onset of perianal eczema to a certain extent. The medication should seize the four points of “wind, heat, dampness and blood” to dialectically use the medication. The clinical manifestation of wind in eczema is itching, “wind win is itchy”, the disease starts because of external wind, or blood dry wind, or liver and kidney yin deficiency, wind from within, so dispel the wind to stop itching throughout, itchy can be added to thorn, wind products such as wind. The clinical manifestation of eczema in those with heavy heat is flushing of the skin around the anus, mild edema, and a higher skin temperature when touched, so the treatment of heat can include heat-clearing drugs such as Phellodendron, Qin Pi, Gentiana, Forsythia, Xia Ku Cao, and Bitter Ginseng. The wet heavy eczema clinically manifests as localized anal skin dampness, papules, blisters, ruptures with more secretions breeding out, so the treatment of wet can add dry damp products such as Atractylodes, Dandelion, Dioscorea, Tu Fu Ling, Angelica dahurica, Alum, etc. Blood deficiency of eczema clinically manifested as local skin pale or dull, dry and rough skin, loss of moistening, scratching chapped, both itchy and painful, this is a long illness blood deficiency wind dry, and because “long illness will be stasis”, wind-damp poisonous evil, long into the complex, evil stasis blockage, so also from the treatment of stasis, can add white peony, angelica, peony skin, safflower, peach nuts and other blood nourishing The products that invigorate the Blood can be added. Generally speaking, the wind evil runs through the whole course of the disease, and itchiness indicates that the wind evil is heavy, so it is appropriate to treat the wind throughout the treatment. The wind is a yang evil, easy to carry moisture and heat, the disease at the beginning of the acute phase of perianal eczema or chronic perianal eczema acute episodes, the wet and heat of the two evils more to heat evil is heavy. With the development of the disease, the heat evil gradually recede, wet evil to stay, so the sub-acute period more wet evil is heavy. The disease is long spleen deficiency and blood dryness, skin loss of nourishment, coupled with the long-term disease into the complex, so the chronic phase of treatment from the blood nourishment, blood to do more consideration. Once the perianal eczema is scratched and spread, expanding the inflammation area, there is a possibility of co-infection. The method of treating perianal eczema with topical Chinese medicine should closely grasp the four points of “wind, heat, dampness and blood”, identify the evidence, add and subtract with the evidence, and receive better clinical results. During the treatment of this disease, in addition to the medicated sitz bath, the following points should be kept in mind: 1. Remember to scrub locally with hot water and soap, and the external Chinese medicine should be decocted and finished before drying and warming (fumigation with high temperature Chinese medicine is prohibited). 2, acute and subacute patients should not apply ointment locally, so as not to make it more difficult to disperse the dampness in the anus and aggravate the disease. 3, avoid scratching, friction, so as not to break infection. 4, prohibit stimulating food, more fiber diet, develop good bowel habits, keep the stool smooth and anal clean. 5, underwear washed, direct sunlight drying the best, can play a role in killing the fungus.