Types of Hemorrhoids
There are three major types of hemorrhoids: hemorrhoids (piles), which are wart-shaped swelling, anal fissure which are tears in the skin on the anus, and anal fistula which is pus tunnels developing between the end of the bowel and the skin near the anus.
Hemorrhoids (piles) are wart-shaped swellings on the anus.
The piles that form on the inside of the anus across the dentate line are called internal hemorrhoids, whereas the ones that form outside are called external hemorrhoids.
Anal fissure are tears in the skin (anal epithelium below the dentate line) near the exit of the anus. Skin in this area is torn by the passage of hard stool when constipated or by strong pressure during diarrhea, causing poor blood circulation around the anal canal. The anal epithelium below the dentate line has sensory nerves (nerves that feel pain) unlike the mucous membrane inside the anus, which can result in severe pain along with anal fissure.
Anal fistula is tunnels that goes between the rectum and skin near the anus. Anal abscess filled with pus develops around the anus, which turns into an anal fistula if it becomes chronic.