Burning thigh

Okay, I have like this huge burning sensation on the back of my right thigh. It’s not even inside or anything, it’s like my actual skin that has that feeling. At first I thought I had a bruise but when I checked, I have nothing. It don’t have cuts or rashes back there. I can feel the burn when I rub it and I didn’t hurt myself either, it just randomly started hurting earlier today. It’s bothering me, I could feel it when I lay down on my side, my back. Can feel it while I walk. I don’t know what it is and I don’t know if anyone ever had that happen to them before or something similar. Would like to know your thoughts on this.