Thank you for the query.
is always a source of infection which human body tries to eliminate. This causes immune system immobilization and sooner or later results with pus accumulation. The pus always seeks for a place to get evacuated. We can compare it to the river which always finds a place to pass any obstacle. In some cases the pus can find such place in the rectum
. This can cause rectal fistula
This is the most serious complication of pilonidal cyst which happens rather rarely.
Generally leaving pilonidal cyst without treatment it is not a good idea. Abscess
formation (pus accumulation) can also lead to whole body infection.
Pilonidal cyst can not disappear by itself. It needs to be removed.
Hope this will help. Feel free to ask further questions.