a swollen anus may be very uncomfortable, but in most cases, the causes are temporary and pose no long term risk. anal swelling can occur after rough anal sex or insertion of a sex toy into the anus. Inflamed anus and swollen rectum the rectum is connected to the anus via the narrow anal canal. a swollen anus may actually be due to a swollen rectum, since the two parts of the body are so closely related. Anal and rectal swelling range in severity, from common conditions that you can treat at home, such as hemorrhoids, to conditions that require a doctors care, such as cellulitis. Fissures a fissure is a tear in the anal canal that can be very painful. Fistulae a fistula is an abnormal channel between two parts of the body, such as the anus and the skin. Swelling in the anal sphincter ulcers an ulcer is a hole or sore in the lining of a structure, such as the anal muscles. An anal abscess is a painful condition in which a collection of pus develops near the anus. Most anal abscesses are a result of infection from small anal glands. A lump near anus such as near anal sphyncters (around the anus) called lump on sphincter a lump inside the anus or slightly above anus a lump just outside the anus (external lumps) when should i contact a doctor? In most cases, anal lumps are not major concerns. Cheng on swollen sphincter muscle the sternocleidomastoid muscle can oftentimes get swollen from muscle spasms. However, please have someone evaluate this because recently i diagnosed a patient with a fluid cyst underneath that needed drainage. Anal stenosis, also known as an anal stricture, is the narrowing of the anal canal, located just before the anal sphincter. What is the anal sphincter? The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste. It is strong enough to restrict the passage of any fecal material but sensitive. Anal pain (pain in the bottom) can be distressing, but its often just the result of a minor, treatable problem. The medical name for pain in and around the anus or rectum is proctalgia. An anal fissure is a small tear in the skin of the anus that can be caused by passing a large or hard poo.