Pilonidal Sinus: A Comprehensive Guide to Causes, Symptoms, Treatment, and Prevention
Pilonidal sinus: A pilonidal sinus, or coccygeal pilonidal cyst, is a common skin condition that appears at the base of the spine, just at the tailbone. Although it may start small and painless, it can become chronic if infected. It often occurs in young people, especially men who spend a lot of time outdoors.