So about a month or two ago I noticed this even indentation that wraps from the front of my leg around the outside around to the back of my leg, almost like a perfect ring about halfway up my upper leg. It just feels like there is a sunken ring in my leg for some reason, and its only on one. Not sure what it is or caused by, but have noticed that if i work my legs alot like on an elliptical or something, it will go away a little from where my muscles harden up, but only temporarily. Any ideas what this is or how to help?