If the anus is only itchy at night, consider an infection with pinworms, which have a habit of coming out at night and crawling into the perianal area to irritate the skin around the anus and cause itching. Pinworm infections are usually common in children, but they also occur in adults. After pinworm infection, you need to take oral insecticides such as albendazole tablets once a day for five days, one tablet a day, to kill the worms. After pinworm infection, you must not scratch with your hands, otherwise you will scratch the skin around the anus and cause infection. People with pinworm infection must pay attention to not eating beef or mutton during the illness, prohibit alcohol consumption, and eat a light diet, usually five days of medication, the symptoms will significantly improve.