According to the introduction, anal itching is characterized by intense and long-lasting itching, especially at night or in humid environments, the itching is even worse, which seriously affects the normal life of patients. When the itching is severe, the local skin of the anus will also scratch, blood scabs, pigmentation, mossy sclerosis and even secondary infections due to scratching. Perianal itching is caused by damage to the nerve endings of the skin, so although the itching at the anus is unbearable, the naked eye cannot see anything different. Patients should be seen in a hospital, and it is recommended that they first consult an anal surgeon. Perianal itching is not difficult to treat, and it is crucial for patients to identify the cause, make a clear diagnosis and treat the cause. Therefore, patients must seek medical attention in a timely manner after discovering the condition, cooperate with the doctor to do local and systemic examinations, through the doctor’s naked eye, anal finger examination, anoscopy and, if necessary, examinations about parasitology, and never blindly use drugs without understanding the situation. As far as perianal skin diseases are concerned, perianal eczema, neurodermatitis, ringworm, various warts, venereal diseases, sweat glanditis and other skin diseases can cause anal itching, the most common of which is perianal eczema. Perianal eczema is mainly manifested as skin damage such as papules, blisters, or even vesicles and ooze around the anus, often caused by intense itching and scratching, resulting in thickened, mossy skin around the anus, which mostly turns grayish white in appearance. The most common cause of eczema is the spillage of intestinal mucus or a small amount of feces into the perianal skin, which is not scrubbed in time, thus stimulating the perianal skin. For perianal eczema, a wet cotton ball should be used to clean the perianal area after the stool, then gently wipe dry, use drug-free antiseptic talcum powder to prevent moisture, and place a small cotton ball loosely on the anal verge to keep it fresh, and patients with more serious conditions must be treated with anti-allergy. If the perianal skin itching is caused by fungus, it is necessary to take off skin debris to find fungal spores under the microscope, after the diagnosis can be taken to apply local antifungal drugs, serious cases or combined with other parts of the fungal infection can be used intravenously systemic drugs at the same time. If you have a history of unclean sexual intercourse, you must go to the dermatology department of a regular hospital, because sexually transmitted diseases such as condyloma acuminata and AIDS can also cause perianal and vulvar itching, so you must not delay diagnosis and treatment. In addition, anorectal diseases such as hemorrhoids, anal fissures, anal fistulas, anal sinusitis, anal papillitis, rectal prolapse, anal incontinence, etc., lead to increased secretions at the anal opening and moist stimulation of the skin thus causing itching. There is an important reason why perianal itching should not be underestimated, that is, chronic kidney disease, renal failure, abnormal liver function, diabetes, gout and other systemic diseases can cause anal itching, as well as in recent years it was found that in people over 60 years old, one of the initial symptoms of some anal canal and perianal malignant tumors is perianal itching. If the perianal skin or spot marks are hardened or ulcers are formed with itching, or even bleeding, pain and discharge, the possibility of cancer should be alerted. Of course, the final diagnosis of perianal tumor has to be made at the hospital by a specialist for anal finger examination and pathological biopsy. The itchiness of the perianal area can be extremely itchy during the daytime when the patient’s attention is distracted and does not notice the itch, but at night when it is quiet, the itchiness is especially obvious and many patients wake up from sleep with itchiness and cannot sleep at night. Dr. Liu reminded this, the summer heat, the public to prevent perianal itching to pay attention to the daily details: 1, weekdays to keep the anus dry and clean, after each bowel movement is best to scrub the anus with water. And as far as possible every night to clean the anus. It is advisable to use warm water to clean the perianal area. The actual fact is that you can’t use soap, especially not strong alkaline soap. The towels and basins used for cleaning should be dedicated to each other to avoid cross-infection. 2, underwear to choose breathable and loose material, and to wash and change, in the sun to sterilize. Itchy people do not wear tight, too hard pants. 3, do not sit for a long time on hot days, especially those who wear jeans should pay attention. It is recommended to stand up and pat your buttocks for an hour or two of work to relax. 4, eat more vegetables and fruits, do not eat or eat less stimulating food, such as chili, strong tea, coffee, high alcohol, etc.. Allergic people should eat less allergy-prone food, such as fish, shrimp, etc., and avoid contact with chemicals that cause allergies. 5, to actively treat those diseases that can cause anal itching, such as diabetes, chronic kidney disease, abnormal liver function, etc. 6, pay attention to the combination of work and rest, keep a happy mood, prevent excessive tension and anxiety, do not scratch the anus, do not use too hard objects to rub the anus.