The reason for the formation of abnormal swelling around the anus differs depending on the disease of formation, as follows: First, external hemorrhoids, due to sedentary or long-term standing leading to venous reflux disorders, the formation of varicose vein masses protruding from the skin surface, will always exist outside the anus as soft fleshy bumps. The second, internal hemorrhoids out of the anus, due to hemorrhoid venous reflux obstruction formed internal hemorrhoids, as the nucleus of the hemorrhoid increases out of the anus, will be manifested as a meat pimple from the anal growth. Third, perianal abscess, with the aggravation of abscess, the skin around the anus is weak and the abscess will protrude from the anus to form a prominent red and swollen mass. Fourth, anal skin redundancy, due to other perianal diseases such as hemorrhoids, repeated stimulation leads to the proliferation of anal skin bridges and the formation of hyperplastic skin redundancy. Fifth, anal polyps, which are thought to be caused by chronic inflammatory stimulation, have a tendency to become malignant. Sixth, malignant tumors of the anal area such as anal cancer. Seventh, the special sense of the anal area, such as the formation of surface skin bumps such as condyloma acuminatum, etc.