Itchy around the anus after sitting for a long time, may be due to hemorrhoids, perianal eczema, allergic dermatitis and other reasons. 1. hemorrhoids: hemorrhoids will make the anal sphincter relax, so that urine, feces and secretions from the anus, so that the local location of the moist, sedentary will make the secretions for a long time to stimulate the anus area, there will be a sedentary itchy around the anus after the symptoms of the great. You can choose to use lidocaine cream, hydrocortisone cream and other drugs for treatment. 2. Perianal eczema: If you are suffering from the symptoms of perianal eczema, sitting for a long time will make the sweat stay in the perianal area, and long time local stimulation will cause the phenomenon of itchy perianal area after sitting for a long time. You can choose to use topical glycerine lotion, tacrolimus cream, etc., oral amoxicillin capsules, loratadine tablets and other drugs for treatment under the guidance of a professional doctor. 3. Allergic dermatitis: If you are allergic to the material of wearing clothes, sedentary will make the skin and clothing prolonged contact, allergic reaction, may lead to sedentary itchy symptoms around the anus. You should avoid contact with allergens in time, and choose to use tacrolimus cream, loratadine tablets and other medications for treatment under the guidance of a professional doctor. The cause of the itchy perianal area after sitting for a long time has more causes, should go to the hospital in time for examination, to give targeted treatment after the cause is clear, do not use private medication, in order to avoid adverse reactions, delay the condition.