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Answer by DRS (621) Typically, a bulls eye rash is caused by the bite of a Lyme disease carrying deer tick. This rash has a red spot in the center, with a larger red area circling it. A circular rash, however, could also be ringworm. Ringworm is a fungal infection of the skin.
It is possible to have Lyme Disease without a bullseye rash but not likely. Plus, usually a tick has to be stuck on you for a long time to transmit Lyme so most likely you would have noticed it. It sounds more like you should see an internist and get worked up for an autoimmune problem.