Bullseye Rash After Hiking

Greg is a 41-year-old male presenting with expanding bullseye rash on the thigh after a hiking trip. I'm 41 and I noticed a rash on my right thigh that keeps getting bigger over the past several days. It's a red ring with some clearing in the middle, kind of like a target or bullseye. It doesn't really hurt or itch. Your task is to take a focused history from this patient.