When I touch the service of my upper legs (skin) or when I bend my legs, I get this tremendous burning sensation. It feels like a severe and then some sun burn. Clothing, sheets moving across my skin triggers the pain. And of course, the bending motion. I only have the pain on upper sides of my legs (ankles to hips though) I describe to others as extreme sunburn or what it might feel like if you took a cheese grater across your skin. No luck with diagnosis. No luck with meds. No visible marks on my legs. My legs to not feel warm/hot to the touch to someone else but feel warm to me. Any ideas