Lumps Around the Anus: Causes a Surgeon Will Check For

Finding a lump around the back passage is understandably worrying. Most have harmless explanations, but it's sensible to know what they can be and when to get checked.

Common causes

• External haemorrhoid, especially if thrombosed (a tense, painful lump).
• Skin tag, often left after a healed pile or fissure.
• Abscess — a painful, swollen, sometimes feverish lump needing prompt drainage.
• Anal fistula opening, which may discharge.
• Anal warts, small lumps caused by a viral infection.

Less common but important

Rarely, a lump can be a sign of something more serious, including a tumour. Symptoms overlap with benign causes, which is exactly why a new or changing lump should be examined rather than assumed.

When to get it checked promptly

See a doctor soon if a lump is painful, growing, bleeding, discharging, accompanied by a change in bowel habit, or if you're simply unsure what it is. A painful swollen lump with fever may be an abscess needing urgent treatment.

What an assessment involves

A straightforward examination usually identifies the cause; further investigation is arranged if needed.

This article provides general information and is not a substitute for individual medical advice. Please consult a qualified clinician about your own circumstances.