Pilonidal Sinus - Pilonidal Sinus A Pilonidal Sinus is a depression in the skin or small pit that occurs at the bottom of the tailbone and can become infected and filled with
Pilonidal Disease | ASCRS
NewSouth NeuroSpine | Tailbone Pain: Overview, Causes, and Treatment
Pilonidal Sinus: Causes, Symptoms, and Treatments
Should I be worried that my tailbone sticks out like a ball of bone just at the top of my butt crack? - Quora