When I got back to the house, I felt something crawling on my arm... it was a tick! At least he was crawling, rather than buried into my skin. But this was a warning to me to check for others.
This morning before getting dressed, I had Cliff look my backside over (a job he never seems to mind, for some reason). Sure enough, there was one on my upper back in about the same spot the above rash was found, feasting on my blood. I examined it closely and found it to be a female "wood tick" or "dog tick" (Click HERE to see what different varieties look like). Whew. I simply have to start wearing insect repellent.