I have noticed over the past month an occasional pain in the area of my tailbone, right at the top of by butt crack. It feels like a bruise, although I have no memory of injuring it. It comes and goes, and is usually more noticible at the end of the day. Nothing feels swollen or anything. A few months ago, a chiropractor told me that my hip was out of place, and re-adjusted it. Could this pain be due to my hip being out of place again?