Try not to worry!
I had, and obsessed over this last year.
Bad year for me, lots of stress and a bereavement. Had odd patches of burning skin on arm and leg, like a stinging burn, sunburn-ish, but skin looked normal and pushing it didn't hurt. It freaked me out about all sorts of diseases, but it really was anxiety. I also felt very sensitive to touch for a while and the slightest knock felt like my bones were broken. Wondered if i had fibromyalgia but nothing came of it in the end.
It lasted, that beast, for nearly 9 months! So don't fret about the timescale. It can linger for a long time!
Best is not to fear, it. It eventually becomes background noise, so to speak, and then fades.