08/10/2018
Pilonidal sinus-Pilonidal means a 'nest of hair'. A pilonidal cyst is found near the tailbone or top of the buttocks crease. It may look like a pit or small depression. In some cases, it may have a hollow tunnel (sinus tract) that connects it to the surface of the skin. Normally, a pilonidal cyst does not cause symptoms. But if it becomes infected, it can cause pain and swelling.