I have a rash on my left wrist what could be the cause?!?

I noticed it about 6 hours ago. There was like red dots (they weren't raised) on my left wrist and just my left wrist. Then AFTER this i fell in nettles and now my legs are just burning like mad. Could this be a deadly combo? What's wrong with me? To clarify i fell in the bush after the wrist thing...