I have severe itching on my arms and legs only. It is sporadic, and once scratched, the skin is a small, open sore that scabs over. The location never itches again, but it will move down my arm or leg to another location. It's uniform on both sides, i.e. if it itches above the knee on the right side, it is the same on the left. This happened during the summer on my arms and chest, and I thought I could be having an allergic reaction to sunblock. Since it's winter and I haven't worn sunblock, I'm assuming this is not the case.