Doctors don't always have a clue. One time I found a tick on my upper arm and pulled it off. A few days later there was a nasty looking bulls-eye rash at that very same spot. I went to the Dr. and he told me it was a spider bite, although I had already told him about the tick. I did ask him what the odds were that a spider would bite me in the exact same place as a tick within a three or four day period. He had no answer but kept saying spider bite. The medicine he gave me worked though. miles