I heard about a woman who had really bad pain in her tail bone. They took all sorts of tests and weren't sure what was going on even though they did see some kind of mass in that area. She went on vacation and the pain got so bad that she could barely walk. When she went to the hospital, they found out that an ingrown hair was burrowing into her actually bone and had become severely infected. The doctors had to surgically remove the hair and clean out the infection. The girl was awake during the procedure and said the smell was absolutely putrid when they cut her open. Just another reason why we wax your crack.