2 weeks back I felt as if a needle was pricked on my buttcheeks when I was sitting in my office cab while coming back to home, I could not find any blood stains while checking it at home. Then next day onward I felt very very little pain on that spot but nowadays feeling inflammation on that point, and pulsating pain (not very intensity) but noticeable. And whenever I stretch my back for any work it pains a more.