I have a red spot the size of a quarter on the top of the back of my thigh, I assume it was a bug bite of some sort, it was very itchy, swelling 3 inch diameter began Friday morning, but has gone down now. No discharge or rash, I haven t noticed any changes in energy or other body symptoms. It does seem to be getting better but I am wondering if it could be lyme disease or something else that could require extra medical attention.