Anal itching after a bowel movement is considered to be caused by anal eczema, perianal abscess, hemorrhoids, anal fissure and other conditions. First of all, anal eczema is triggered by bacterial infection, which will result in small localized blister-like objects with abnormal itching, and once scratched, ulceration, inflammation, oozing and other symptoms of the blisters will appear. Anal abscess will appear as a purulent swelling around the anus, with a feeling of hardness and fluctuation when pressed, and there will be strong pain, itching and a feeling of anal swelling. Second, when hemorrhoids are severe, there may be an enlargement of the nucleus, redness, swelling, pain and itching, especially if combined with infection. In addition, anal fissures are caused by hard stools that tear the local skin of the anus, causing pain, a little bleeding and itching. In addition, it may also be caused by anal fistula and other conditions, it is recommended to go to the hospital for careful examination.