I noticed it because the skin was slightly raised. It looked like a ring of red skin bumps. It has never itched or been scaly, and it never had a "target." I first noticed it on February 28, 2018. Dead winter where I live, so a tick bite seems unlikely?
It has grown bigger in diameter and is no longer a red ring, but a horseshoe shape. Still bumps, still not itchy or scaly. It doesn't hurt and no new patches have occurred.
I am the type to assume the worst ( lymphoma, lyme, previously unknown flesh eating disease.) Any ideas? Thank you.