[Overtaxed]

There were times when I thought I felt some bites on my arms and I squashed a few critters, but nothing left welts and I didn't have any bites on my legs or anything.

Hmmm....I did bring my own bed and bedding....

[RosieCotton]

I don't have welts...just a few bites. I've had worse. I'm not that used to getting bitten up in January, though...

[Ramius]

I brought my own sleeping bag...

I think maybe Bear is onto something with the idea that it is a mild allergic reaction to the critter bites.

Now that I think about it, it might not be animal, but vegetable. Anything out there like poison oak/ivy? For me... I don't even have to touch poison oak. I just get near it and I'll break out. That would explain the spreading, by scratching.