My Right Thigh ( Posterior ) Started To Hurt And

My right thigh ( posterior ) started to hurt and was quite sore. Almost like I had over exerted myself. Then the soreness started to move to the inside of my thigh and a burning feeling started as well. Over the last 3 days this has continue until my thigh, knee and now claf has the same sore burning feeling. Occasionally some itching senseation. I do work long hours on a concrete floor in manafacturing so I thought it was the work. This is something very different. No fever and the skin is not warm to the touch, no rash, and I have not used any medication on it. I typically do not take any meds and have no prior health issues.