Blood congestion at the anal dentition may be caused by anal inflammation, hemorrhoids, anal fistula and other diseases. 1. anal inflammation: due to excessive sweating, poor hygiene, as well as itching and scratching, causing bacterial infections, resulting in anal congestion, itching, pain, etc., you can take metronidazole, cefadroxil and other drugs for treatment. 2. Hemorrhoids: especially internal hemorrhoids, mainly in the anal canal above the dentate line at the end of the rectum mucosa, will cause congestion, defecation will also bleed, the formation of bloody stools, can be through the hemorrhoidal suppository or surgery for treatment. 3. Anal fistula: caused by anal canal or rectal abscess, manifested as pus, blood, mucus secretion from the fistula, can be treated by fistulotomy or excision. When the anal dentate line congestion should be timely consultation to determine the cause of the disease, and under the guidance of a professional doctor to carry out the appropriate treatment, the use of medication please follow the doctor’s instructions.