Medical Bull's Eye Rash of Lyme Disease

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The discussion centers on the characteristics of erythema chronicum migrans, the distinctive bull's-eye rash associated with Lyme disease. Participants express confusion about the biology of the rash, particularly the presence of a white ring that appears unaffected by the bacteria and the fact that the rash can develop away from the original tick bite site. There is a call for insights from dermatologists or microbiologists to clarify the mechanisms behind the rash's formation and its unique appearance. The conversation highlights a desire for a deeper understanding of the biological processes involved in Lyme disease and its symptoms.
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Recently I had Lyme disease and had perhaps the most stereotypical bull's eye rash ever. All medical people I met wanted to see it, and called their friends/coworkers over, took pictures, etc.

But the rash still has me confused about the biology of it. The shape itself doesn't seem to make biological sense to me; why is there a white ring that is unaffected by whatever bacteria is there? Why does the rash occur at a different place than the tick bite?

Thanks for your help!
 
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This is erythema chronicum migrans. I knew of the reason for that bulls-eye appearance but now that I have forgotten, I can't seem to find on internet where I read it.

Can some dermatologist, or microbiologist help us here find the reason?
 

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