An anal fissure, also known as anorectal fissure or fissure in ano, is an open sore or laceration that forms in the lower portion of the anal canal, close to the anus and rectal lining. These are typically widespread as a result of blood vessel irritation. There are two types of superficial skin tears in the anal region: acute anal fissures and chronic anal fissures. Distal to the dentate line is where they are situated. Hemorrhoids and anal fissures are both prevalent, and they both make it much harder to pass the feces.