A perianal abscess is a pus collection causing severe pain and requiring urgent incision and drainage. Decompression brings immediate relief; in a proportion of patients the abscess may later develop into a fistula.
What does it involve?
It is the urgent incision and drainage of a pus collection in the perianal region. Decompression brings immediate relief from the severe, throbbing pain and halts the progression of infection.
Antibiotics alone are not enough: an abscess is a collection that needs mechanical drainage; antibiotics are adjunctive, especially with cellulitis, immunosuppression or heart disease.
When is it needed?
It is indicated urgently for any perianal abscess — severe pain, swelling, redness, often fever. Delay worsens the infection and increases the risk of spread into deeper spaces.
For recurrent, deep (e.g. supralevator/pelvirectal) or atypical abscesses — and in immunosuppressed patients or those with Crohn's disease — imaging (MRI) may be needed for mapping.
Preparation
As an emergency, a brief proctological assessment precedes it. It is done under anaesthesia, allowing adequate drainage and examination under anaesthesia of the area.
How it's done
Under anaesthesia, an incision is made over the collection, as close to the anus as feasible, and the pus is drained; the cavity is cleaned and left to heal by secondary intention.
Aggressive probing that could create a false tract is avoided; where a clear fistula is found, its definitive treatment is often planned at a second stage to protect the sphincter.
Incision & drainage
Urgent decompression of the collection under anaesthesia — immediate relief.
Local healing
Sitz baths, dressings and monitoring of the cavity until healing.
Check for fistula
Follow-up and, where needed, planned treatment of a fistula.
Recovery
Pain relief is immediate, with discharge usually the same day. Local care with sitz baths, dressings and stool regulation follows.
Review in a few weeks is advised to monitor healing and detect any fistula early.
Risks & outcomes
A simple, safe operation with an immediate result. In a proportion of patients a fistula subsequently develops, treated separately.
The abscess may recur if an untreated fistula coexists or if the initial drainage was inadequate; hence adequate incision and follow-up matter.
Frequently asked questions
Are antibiotics enough?
No. An abscess is a pus collection that needs incision and drainage; antibiotics are adjunctive and do not replace drainage.
Will I develop a fistula?
In a proportion of patients the abscess progresses to a fistula. That is why follow-up is needed; if it appears, it is treated separately with sphincter-preserving techniques.
How quick is the relief?
Decompression brings immediate pain relief, usually from the first day.
Will I stay in hospital?
In most cases it is done as a day case.