Perianal Abscesses
These are collections of pus in the surrounding area of the anorectal region, usually happening due to an extension of an anal pathology. In most cases, it starts as an infection of a gland called the anal gland which is situated inside the anal canal. Other causes are fissuring of the rectal wall by a very hard stool or a foreign body like a fish bone, any blood-borne infection or an extension of a skin boil.
These abscesses present as painful swellings in the perianal region associated with difficulty in sitting and fever. The patient may also have constipation if the abscess is closely aligned with the anal canal.