Has anyone had these before? I have this pain that feels like a lump although its difficult to actually see in the mirror, above my tail bone kinda right above and to the side of my butt crack. It kind of came all of a sudden, I think doing leg press(all the weight pushing it against the back piece) aggitated it. Is this something that might go away itself or would require doctor attention? It's not red or anything yet but today is also the first day I felt pain but it is also pretty strong pain for just noticing it, only when pressed on.