About 15 years back I was living in a rural area of New Hampshire and got the "bulls eye" mark on my leg. Never saw the tick in this case but ticks and bites were common around there.
I promptly went to the doctor to get a course of antibiotics and never had further health issues.
Now I'm in rural Texas and surrounded by fire ants. I need to rethink my life choices.
See https://en.wikipedia.org/wiki/Lyme_disease#Treatment