I just had a itching, tiny blister like problem break out on my legs, arms, top of feet. Like you state, everywhere but face. It started out almost like chicken pox. I finally went to the dermatoligist and she said it was folliculitis. She put me on antibiotics, and took a culture of a place I had itched into a open sore. Culture came back as staph infection. Places I had scratched have still not healed completley. She did say the calamine lotion I used to stop the itching dried the skin and aggravated the condition.
It could possibly be scabies.
Have you ever had a Gadolinium Contrast MRI