Hi, one night I was attempting sit ups and I guess I sat wrong because the next day, I experienced pain at the top left side of my butt but more on the inside. As time went on, a lump is something has developed and it is very sore and it hurts to sit, exercise, and is sensitive to touch. I play sports so it s very difficult to get the work done when your butt is holding you back. Please let me know of any treatments.