Pilonidal Sinus is a type of infection that typically occurs as a cyst between the cheeks of the buttocks, and often at the upper end. A pilonidal sinus (PNS): is a sinus tract or small channel, that may originate from the source of infection and open to the surface of the skin.

Pilonidal cysts are itchy and often very painful, and typically occur between the ages of 15 and 35. Although usually found near the coccyx. Intermittent pain/discomfort or swelling above the anus or near the tailbone

Symptoms and Causes of Pilonidal Sinus


  • Symptoms may include pain, swelling, and redness. There may also be drainage of fluid, but rarely fever.
  • Opaque yellow (purulent) or bloody discharge from the tailbone area
  • Unexpected moisture in the tailbone region
  • Discomfort sitting on the tailbone, doing sit-ups or riding a bicycle—any activities that roll over the tailbone area.


  • One proposed cause of pilonidal cysts is in grown hair.
  • Excessive sitting
  • Excessive sweating can also contribute to the formation of a pilonidal cyst

Risk factor of Pilonidal Sinus

Risk factors include obesity, family history, prolonged sitting, greater amounts of hair, and not enough exercise.