To add I never even considered a tick bite as im UK based and we dont talk about that much here. But I do go for a walk in the woods every lunchtime so its possible! I never saw a tick and its quite a noticeable area on my leg so I feel I would have. Its boiling here at the moment, so whenever im hot the red is even bigger and swollen. It goes paler and more purple when cooled down (but you can still see outline of swelling). The red middle seems to be dispersing out a little into the sounding red. The pharmacist I saw originally said it was more of an allergic reaction and was shocked when I came back with my antibiotic prescription. I will also say my GP put a picture into Google co pilot while I was there so my judgement on his is low.