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Pilonidal Disease

What is Pilonidal Disease and What Causes it?

Pilonidal disease (also called pilonidal abscess, pilonidal sinus) is an infection of the skin in the region between the 2 buttocks. It occurs when body area in the area breaks off and gets embedded into the skin. It is more common in men and those with a lot of thick, stiff body hair.

Pilonidal Disease
Pilonidal Disease

What are the Symptoms?

A pilonidal abscess may just be like a small pimple near to the buttock cleft. It may also be a large painful area under the skin. This may discharge some clear liquid, blood or pus. When the pus is trapped within, the area becomes swollen, red and painful. There may also be fever.

Most times, the pain and swelling would settle after the pus is discharged. In some, it settles after a course of antibiotics.

However, as there are hairs trapped below the skin, the infection is never fully cleared and it develops into a pilonidal sinus. There may be one or more small little openings on the skin leading into the cavity below that contains the hairs.

Some patients get repeated infections and inflammation of these sinus tracts, resulting in episodes of swelling, pain, and discharge of pus. Some of these tracts may extend deep towards the bone below.

To prevent worsening or recurrence, seek medical attention promptly to get the abscess drained and the hair removed.

How is Pilonidal Disease Treated?

The treatment depends on the severity of the disease. An acute abscess is treated with a small cut to let out the pus and remove the hair. A chronic sinus may require surgery to remove it completely.

Some patients get recurrent pilonidal disease. Part of the reason is because the shape of the buttocks makes it easy for the hair to get embedded. Complex or recurrent disease is treated by more extensive surgery. This may result in removing a large area of skin and moving different areas of skin in to cover the defect. Larger wounds require longer healing times.

It is most important that after any surgery, the skin around the buttocks be kept free of hair to minimize recurrence.


Our Colorectal Surgeon
Ho Kok Sun Colorectal clinic logo
Dr Ho Kok Sun
Colorectal & General Surgeon
MBBS (Singapore),
M Med (Gen Surg) (Singapore),
FRCSEd (Gen Surg), FAMS
Dr Ho Kok Sun has been treating pilonidal disease for over a decade and was the past President of the ASEAN Society of Colorectal Surgeons and the Society of Colorectal Surgeons (Singapore), as well as a founding member of the Eurasian Colorectal Technologies Association. Dr Ho was actively involved in the training of medical students and residents, and has published widely in reputable journals and book chapters. He believes that treatment should always be personalised to the patient’s needs.

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Ho Kok Sun Colorectal clinic logo
Ho Kok Sun Colorectal

Colorectal Surgeon

3 Mount Elizabeth,
Mount Elizabeth Medical Centre
#04-08, Singapore 228510

Tel (+65) 6737 2778
Fax : (+65) 6737 2389
Email hokoksuncolorectal@gmail.com

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