Hi, my name is Rick. Last night walking into my bedroom, I was stung on the side of my foot. The pain was like a wasp sting, I tried to wipe off what ever bite me but nothing was there. I could not find what bite or stung me. After inspection nothing was at the site, pain was still there. After a couple of minutes the pain which feels like numbness, tingling and skin soreness started to spread. It went from the side of my foot, to the surface of my foot, toe to ankle, then five minutes later it went up my shin and stopped just below my knee. I have no other symptoms, no sight marks, no swelling or redness what so ever, just what I described above. It has been about fifteen hour since the sting, should I be concerned and what do you think it was that bite/stung me? I live in Arizona and I can only guess it was a scorpion.