Anal pruritus is a skin disease in which the skin around the anus does not have any primary skin damage but only pruritus symptoms. More men than women, more often in the usual inactive people. Anal pruritus is a common disease, especially in the spring, mostly in young and middle-aged people aged 20 to 40 years, and some are local symptoms of generalized pruritus, mostly in the elderly. What are the causes of anal itching: 1, perianal eczema: mainly manifested as a circle around the anus appear papules, blisters, and even vesicles oozing skin damage, often due to intense itching and scratching caused by the thickening of the skin around the anus, mossy, the appearance of most become gray-white. 2, viral warts: anal condyloma acuminata or infectious molluscum contagiosum can also cause anal itching. The former mainly shows anal itching. The former is mainly manifested around the anus appear cauliflower-like or cocklebur-like wart-like growths, performance damp and dirty and foul-smelling; the latter skin damage form is round or hemispherical wart-like growths, the center has a “navel”-like depression, the occurrence of the site in addition to the perianal, scrotum, but also spread to the whole body skin. The main reason for this is that it is not only a good idea to have an anal fissure, but also a good idea to have an anal fissure. The stimulation of the pus flowing from the fistula can cause anal itching. 4, perianal skin local physiological changes: sebaceous gland secretion function is reduced, the skin lack of sebum moisturizing, dry skin, skin folding around the anus increased, feces, sweat and dirt easily accumulate in it and often wet, not clean. This is easy to make bacteria breeding, prone to chronic inflammation of the perianal skin mucous membrane junction and cause anal itching. 5, parasitic infection: pinworm disease causing anal itching can account for a significant proportion of people. At night when the anus is relaxed, pinworms often crawl out of the rectum, laying eggs around the anus and mating, causing anal itching due to stimulation of the perianal skin, and characterized by night itching. In the case of scabies, if the skin damage of the vulva spreads to the vicinity of the anus, it can also cause anal itching. In addition, trichomonas vaginitis due to the stimulation of leukorrhea, can also cause anal itching. 6, neurodermatitis: neurodermatitis occurring in the sacrococcygeal or near the anus often causes anal itching, mainly manifested as local skin polygonal and fused together with papules, scratching due to itching often thickens the lesions, mossy like bark. 7, fungal infection: in the hot and humid climate of the season, obese sweaty people prone to skin fungal infection and cause femoral moss or ringworm, often due to the expansion of lesions spread to the anal vicinity and cause perianal itching. The main manifestation is an annular or semi-annular or map-like erythema with clear borders on the inner thighs or buttocks, with a layer of white phosphorous flakes on the surface. The diagnosis can be confirmed when the phosphorous is scraped off and examined under the microscope, such as the discovery of fungal mycelium and spores. Prevention and care: 1. Avoid anxiety, worries and excessive tension. 2, regulate diet, eat more green vegetables, fruits and other fiber-rich foods, forbid or eat less food and condiments that are irritating or can induce metabolic reactions, such as spicy food, strong tea and coffee, strong alcohol, etc. 3, pay attention to hygiene, wash the anus with warm water after the stool to keep the skin fresh and clean. 4, avoid inappropriate self-medication, such as scalding with hot water, external use of high concentrations of corticosteroids or drugs containing anti-irritation, the purchase of some crude home physiotherapy equipment self-medication, these methods have more harm than good, only a temporary suppression of itching, over time, resulting in the lesion to extend the increase, patients should be advised to stop using. 5, close underwear to cotton fabrics is good, clothing and pants should be loose fit, should not be too tight, too hard, so as not to rub the anal skin. 6.Do not scratch, if you have the habit of scratching at night, you should cut your nails or put on film gloves before going to bed. 7. Adjust bowel habits and go to the toilet regularly every day.