maybe you've got sheep ticks.they look like little crabs.you could get dense to give you a close inspection.
I can't go here without having my blood sucked. Via the navel, everytime. They just like it there...
Chiggers/Harvest mites. It's actually the larva of the mites which bite. They inject powerful digestive enzymes into the skin then suck out the liquified cells. I've just come back from a week in the dales and got hit quite badly at Kilnsey and Blue Scar.