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Pilonidal Sinus

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What is Pilonidal Sinus

 A pilonidal sinus (PNS) is a small cyst or abscess that occurs in the cleft at the top of the buttocks. APNS usually contains hair, dirt, and debris. It can cause severe pain and can often become infected, in which case, it may ooze pus and blood and have a foul odor.

A PNS is a condition that mostly affects men and is also common in young adults. It’s also more common in people with a sitting job.

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Causes & Symptoms

Causes:The exact cause of this condition is not known, but is believed to be a combination of changing hormones, hair growth, and friction from clothes or from spending a long time sitting.

Activities that cause friction, like sitting, can force the hair growing in the area to burrow back under the skin. The body considers this hair foreign and launches an immune response against it, similar to how it would react when dealing with a splinter. This immune response forms the cyst around your hair.

Symptoms:

  • Pain when sitting or standing
  • Swelling of the cyst
  • Reddened, sore skin around the area
  • Pus or blood draining from the abscess, causing a foul odor
  • Hair protruding from the lesion
  • Formation of more than one sinus tract, or holes in the skin

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