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Anal abscess or fistula

Also called: Anal abscess, anal fistula

A painful, swollen, pus-filled lump near the anus. It needs draining; some form a tunnel (fistula).

TreatmentDrainage

Overview

An abscess forms when a small gland near the anus gets blocked and infected.

About 1 in 3 abscesses later form a fistula, a tunnel to the skin.

Symptoms

Common signs:

  • Painful swelling near the anus
  • Painful, swollen lump next to the anus
  • Pain, itching, or swelling at the bottom

Less common

  • Fever
  • Drainage

When to get medical care

Call 911High fever.
Get care todayPainful swollen lump.
See a doctor soonSymptoms that last or keep coming back.

Causes

Blocked glands.

Does it spread or run in families?

  • The illness itself usually isn't passed to others, but some germs that cause it can spread.
  • Washing hands often helps.

Who is more likely to get it

  • Crohn's

Diagnosis

Exam.

Treatment

Get care.

Self-care

  • Sitz baths
  • Sit in warm water after bowel movements
  • Keep the area clean

Medicines

Medicines that may help:

MedicineHelps withGood to know
Pain relievers
Pain and swellingAsk first if you have kidney, stomach, or heart problems.

OwieClear doesn't give doses: follow the label or your healthcare professional. Medicine names here are examples, not a full list.

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to a gastroenterologist or a colon and rectal surgeon.

Children, pregnancy, and older adults

  • People with Crohn's: Higher risk.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your prenatal provider about this condition.
  • Some infections can pass to the baby during pregnancy or birth. Tell your provider if you've been exposed.
  • Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
  • Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
  • Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

Outlook

Treatable.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • A list of your medicines and supplements
  • Notes on when symptoms started and what makes them better or worse

Questions to ask

  • Will I need fistula surgery?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Anal abscess or fistula

Sources

Last updated 2026-11-12.