Sentinel hemorrhoids, as well as anal papillomas, are formed by prolonged, recurrent anal fissures, inflammation, and irritation from secretions. In many people, the sentinel hemorrhoids are dermal and soft. In anal fissures, the anal papillae at the upper end of the fissure are enlarged and swollen due to edema, and the skin at the lower end can be edematous and form a flap called a sentinel hemorrhoid. It is clinically known as the “anal fissure triad” because it exists together with anal fissure and anal papilla hypertrophy. The doctor can stick a finger into the patient’s anus to check the disease, which is a simple but very important clinical examination method. Examination method: Anorectal examination can be divided into two parts: external and internal finger examination. The method of extra-anal finger examination is: after wearing gloves, use the index finger to touch the area around the anus for hard knots, swellings and pressure pain, and to check whether there are fistulas, cords and directions under the skin outside the anus. The method of internal anal finger examination is: after wearing gloves or finger cover, apply some lubricant to the index finger and anal area, and extend the index finger into the rectum for examination. 2.rectal finger examination is a method of examining the rectum through finger examination. (1) severe pain to palpation is seen in anal fissure and infection; (2) pain to palpation with fluctuating sensation is seen in anal and perirectal abscesses; (3) soft, smooth and elastic masses to palpation are mostly rectal polyps; (4) hard and uneven masses to palpation should be considered rectal cancer; (5) mucus, pus or blood on the surface of the finger sleeve after finger examination indicates inflammation or tissue destruction, which should be taken if necessary. If necessary, smear microscopy or bacteriological examination should be taken to help diagnosis. 3.Proctoscopy Check whether there are malignant tumors of the rectum and colon or clinical symptoms of rectosigmoid irritation. Examination procedure: A 140cm-long bendable fiber tube with a light source and a miniature electronic camera is used to slowly enter the large intestine through the anus to examine lesions, tumors or ulcers in the large intestine, and if necessary, tissue examination or removal of large intestinal polyps. 4.Anal visual examination The skin around the anus is examined for thickening, redness, blood, purulent secretions, rashes and fistulas. Examination method: the patient stands with his back to the light in the anterior prone position, with his upper body bent forward to the side of the bed, so that the hip is bent into a 90-degree position, and the doctor stands at the side of the patient, using both thumbs to gently separate the hip muscles to expose the anus.