Written and medically reviewed by: Assoc. Prof. Cengiz Dibekoğlu, MD, General SurgeryLast updated:
Causes of Anal Abscess
Blocked anal glands, infection, and risk factors — not “poor hygiene”
The usual pathway is cryptoglandular infection: an anal gland blocks, bacteria multiply, and a pus pocket forms. Hygiene is not the culprit. Crohn’s disease, diabetes, or immunosuppression can set the stage.
Educational schematic. Some structures may be simplified or emphasized for clarity; not an exact anatomical depiction.
© Cengiz Dibekoğlu — illustrative; not for unauthorized use
Figure summary
This educational figure shows: Causes.
Key points
Cryptoglandular infection
Gland openings in the anal canal block. Pressure and infection rise; pus spreads around the gland toward skin or deeper spaces. This is the shared story of most classic anal abscesses — mechanical blockage and bacterial growth, not a cleanliness accusation.
- Key note inside
Conditions that raise risk
Diabetes, immunosuppressive drugs, HIV, chronic diarrhea/constipation cycles, and inflammatory bowel disease can increase risk or severity. Prior abscess or fistula raises the chance of another attack in the same area.
- Diabetes / weakened immunity
- Crohn’s disease
- Prior abscess or fistula
Crohn’s and other causes
In Crohn’s, abscess and fistula can be more complex and are planned with medical therapy. Rarely tuberculosis, trauma, or foreign body play roles. Atypical sites, multiple abscesses, or non-healing wounds need extra work-up.
What it is not
Thrombosed external hemorrhoid, fissure, pilonidal abscess, or skin furuncle can hurt similarly. Exam separates them — self-diagnosis plus antibiotics alone can delay needed drainage.
Frequently asked questions
Did I cause this by being unclean?
No. Cryptoglandular blockage and infection drive most cases.
Can I squeeze it at home?
No. Squeezing or puncturing can spread infection — seek surgical drainage.
More chapters in this hub
Anal Abscess Symptoms
What patients notice — and which warning signs need urgent care
Anal Abscess Diagnosis and Types
Exam, locations, and when imaging helps
Anal Abscess Treatment
How treatment options are matched to risk, stage, and goals
After Abscess Drainage
Open wound care, sitz baths, and warning signs
Abscess to Fistula Risk
Fistula risk — explained for shared decision-making
Appointment / info
This page is for education. It is not medical advice and does not replace a visit with your physician.
Medical editor: Assoc. Prof. Cengiz Dibekoğlu, MD · Last medically reviewed: August 2026 · English patient-education chapter.