What are these odd spots/blisters all over my body?

I have been getting these little itchy blisters pretty much everywhere on exposed flesh (legs, arms, chest), but not my face. It starts out looking like an ingrown hair or small blister - they itch and if I burst them they don't bleed, but might fill with clear fluid again. Some go hard and have a hard white scab that doesn't come off (almost like a callous).

It's not chickenpox - I've had that and this has been going on for about 10 days now without the usual all over breakout that epitomises chickenpox..