I have a red rash on my arms, legs, and now in my head. The rash on my legs looks like razor burn, but its not. The rash on my arms, when scratched, is flaking. I have had this rash for 3 weeks now and it is getting worse, not better. Just within the past three days the rash has spread into my head and now it is really starting to itch and drive me crazy. What is going on?