NHS Choices Condition
Content supplied by NHS Choices
Most pilonidal sinus cases occur just below the tail bone, in the area of skin between your buttocks. Some cases have been recorded where a poilondial sinus has occurred in the umbilicus (belly button) or hands.
A pilonidal sinus will cause no symptoms until it becomes infected, although you may notice its presence as a small pit, or depression, in the surface of your skin.
Once the sinus becomes infected, the pit will begin to swell and you may experience symptoms that include:
- pain,
- redness of the skin,
- pus and/or blood draining from the sinus (the pus usually smells unpleasant), and less commonly,
- fever: a temperature of 38C (100.4F) or above.
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