The itching of the anus should depend on the disease causing the perianal itching to decide, there are three main possibilities: 1, hemorrhoids, due to the repeated prolapse of hemorrhoids, can cause intestinal fluid persistent stimulation of the skin around the anus, so that the skin around the anus is chronic inflammatory changes. The itchy perianal area can be treated with roxithromycin ointment applied to the itchy area and a 1:5000 potassium permanganate bath, and hemorrhoid cream applied locally to the anus. 2. perianal allergic rash, clinically manifested as perianal redness and swelling and scattered red papules, should be kept away from allergens while taking oral anti-allergy drugs, such as keratan, and local hormone ointment for symptomatic treatment. 3. perianal parasitic infection, when When the intestinal parasites are discharged with the stool, some of them can be attached to the skin around the anus causing perianal itching. It can be cleared by oral intestinal worms, and the itching is obvious to apply Pirexone ointment.