A sinus tract is a small abnormal channel (like a narrow tunnel) in the body. A sinus tract typically goes between a focus of infection in deeper tissues to the skin surface.

Hemorrhoids, also known as piles, are pathologically dilated anal cushions or swelling on the inside of the anal canal.

An anal fistula is an infected tunnel between the skin and the anus, the muscular gap at the end of the digestive tube.

An anal fissure is a small tear in the lining of the anus, causing pain and bleeding during bowel movements. Prompt treatment can ease discomfort and promote healing.