An anal fissure is a tear or break in the skin of the anal canal. It is a small tear in the thin, moist tissue that lines the anus. Anal fissures generally occurs when a person passes hard/ tight/ large stools during a bowel movement & making him strain more which causes fissure in anal region (a small cut). Anal fissure can be noticed by bright red anal bleeding sticking to the stool or may be falling in little small drops during stool or in washing the anal region after stool.