Pilonidal Cyst or Pilonidal Sinus: Is There a Difference?

Pilonidal cyst and pilonidal sinus are, in almost every case, two names for the same problem. People search for a pilonidal cyst in Dubai, a cyst at the tailbone, an abscess in the bum crack, or a small hole above the buttocks that leaks. Surgeons are more likely to write pilonidal sinus disease. The words differ because they describe different moments in the same story, not two separate conditions. If one clinic used one word and everything you read online uses the other, this page is about that gap.

Why you hear two different words

A true cyst is a closed sac lined with its own skin-like layer. Pilonidal disease is not that. It is a tract: a narrow tunnel running from one or more small openings in the skin of the buttock cleft down into the tissue underneath, usually holding loose hairs and debris. Tract is what sinus means. The word cyst stuck because when the tunnel blocks and fills, it swells into something that looks and feels exactly like a cyst under the skin. So cyst describes what it looks like during a flare, and sinus describes what it actually is the rest of the time.