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Red herring (sp) just common term for false lead ...not medical condition ..
Sounds that you have skin infection --- cellulitis which has failed to respond to the first course of antibiotic ...
Follow up recommended
Possible that small foreign body in tissue is still present ..
You may benefit to see dermatologist for this ...
I think exam under magnification may be helpful to your case
I suspect that you need further antibiotic treatment with different class of antibiotic than the first
I hope that this information is helpful for you
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Thank you and Best Regards,
Anthony Bray MD