I had the bull's eye rash on my stomach after being bitten by a spider (in 2003?) and I live in New Mexico, where the lymes tick is not found. I test positive for lymes, vectors...
I suggest spraying dirty clothes with "bug arrest" or eco-vie before washing them. While in the woods spray down your tent, clothes and body to kill the spider/ticks. Bug arrest and eco-vie are non-toxic enzymes that break down the chitin "shells" of spiders, etc.
What is chitin?
I love to camp.
itwl,
~jonsi