Anal ulcer edema may be caused by hemorrhoids, but there are many reasons for anal ulcer edema, not necessarily due to hemorrhoids, but also due to anal fissure, perianal eczema, perianal abscess and so on. 1. Hemorrhoids: hemorrhoidal patients with hemorrhoidal rim skin flora will appear venous lymphatic return obstacles, resulting in local anal tissue edema, and even ulcers. In addition, hemorrhoids are also manifested as anal prolapse, bleeding and other symptoms. 2. Anal fissure: mostly due to abnormal bowel movements, spasm of the internal sphincter, etc., the surface of the anal canal tissue at the exit of the digestive tract splits, forming a fissure. When the fissure is infected by bacteria, the skin breaks down, which in turn shows symptoms such as anal ulcer, edema and blood in stool. 3. Perianal eczema: If the area around the anus is in a humid environment for a long time, perianal eczema may be triggered. Mainly manifested in the skin near the anus appear pimples, itching, etc., after repeated scratching may cause anal ulcers and edema. 4. Perianal abscess: purulent infection around the anus and interstitial abscess formation, inflammation development of the abscess will be broken, will form an ulcer around the anus edema phenomenon, from the ulcer mouth intermittent pus, accompanied by perianal hardness, itching and other symptoms. If the symptoms of anal ulcers and edema, it is recommended to go to the hospital to find out the specific causes of anal ulcers and edema, do not self-medication, should follow the doctor’s instructions in the doctor’s guidance for targeted treatment, to avoid aggravation of the condition.