Hemorrhoids, anal warts and anal fistulas are three different types of growths or spots that can appear in or around the opening of the anus. Hemorrhoids are swollen veins in the lower rectum and anus. Hemorrhoids can form inside the rectum or under the skin by the anus. They can be caused by:. Anal warts are caused by the human papilloma virus HPV , which is a sexually transmitted disease. Typically, they grow in and around the anus or the genitals.
The anus is the opening at the end of the digestive tract where stool leaves the body. The rectum is the section of the digestive tract above the anus where stool is held before it passes out of the body through the anus. The anus is formed partly from the surface layers of the body, including the skin, and partly from the intestine. The rectal lining consists of glistening red tissue containing mucus glands—much like the rest of the intestinal lining. The lining of the rectum is relatively insensitive to pain, but the nerves from the anus and nearby external skin are very sensitive to pain.
The intestinal tract or bowel ends with the rectum. It ends with the anus — the opening to the outside of the body. There are several common problems, including hemorrhoids, that can occur in the area from the rectum to the anus. While almost everyone has heard of hemorrhoids, the other conditions are not so well known. Most people have experienced a tear or fissure at the corner of the mouth that can occur in cold weather or when yawning.