Likely cause
Causes of pilonidal sinus
Ingrown/embedded hairs causing a foreign-body reaction
* Deep natal cleft
* Friction and prolonged sitting
* Excessive sweating/moisture
* Obesity
* Excess body hair
* Poor local hygiene
* Previous pilonidal disease or trauma
What to watch for
Painful swelling near the tailbone
* Redness and warmth
* Pus or bloody discharge
* Foul-smelling drainage
* Fever or chills
* Rapidly increasing pain/swelling
* Recurrent abscesses or persistent drainage
What you can do
Keep the natal cleft clean and dry
* Wash gently with soap and water, then dry thoroughly
* Avoid prolonged moisture and sweating
* Remove loose hair regularly if advised
* Avoid tight clothing and prolonged sitting
* Do not squeeze or pick the sinus/abscess
When to see a doctor
* Painful or enlarging swelling
* Pus or blood discharge
* Fever or chills
* Increasing redness or warmth
* Recurrent episodes
* Persistent/non-healing opening or drainage
* Severe pain or difficulty sitting/walking
This is general information from a verified doctor and is not a diagnosis or a substitute for an in-person consultation. In an emergency, seek immediate medical care.
