Pilonidal sinus disease

Rectal Clinic

Pilonidal sinus (PNS) is a small hole in the skin that is formed at the natal cleft at the top of your buttocks. PNS can form a cyst if dirt or hair begins to collect in the small hole, causing it to get infected with pus and blood.

What happens during your appointment?

At your appointment your consultant will review your medical history which will include any previous drainage or changes experienced in the area. This will be followed by an examination of the site where they will look for any redness, inflammations or other abnormalities.

If necessary, you may need tests or scans to rule out infection and confirm your diagnosis.

Treatment options

If the pilonidal sinus is not infected, your consultant will advise no treatment but encourage you to monitor the area for any changes. If you do notice any changes i.e., the area has reddened, bleeding, painful and oozing pus your consultant will recommend a treatment tailored to you.

What are the symptoms you may have?

Pilonidal sinus may start of as a small depression in the skin with no noticeable symptoms. Once infected, however, the depression develops into a cyst or abscess.

  • experience severe pain when sitting or standing
  • pain and swelling of the lesion
  • redness and a sore skin around the area
  • pus or blood draining from the abscess, this leading to a foul odor
  • hair protruding from the cyst
  • fever (very rare)
  • formation of more than one sinus tract

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108 Harley Street, London, W1G 7ET

+44 (0)207 563 1234
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