Hello, thank your for welcoming me on the forum.
Essentionally I was icing my leg and when I was done I felt this burning behind my knee where I'd been icing. I looked to find the blister looking ring. Within a half hour the rased blister part went down and the entire rash turned red. There was no bulls eye or rings or cut in the center and it was about 1.5 inches and did not grow. about 24 hours later it was gone.
Thanks so much for the responses, just trying to put the pieces together.. :)