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erythema migrans
microscope picture spirochetes

Erythema migrans

The pathognomonic erythematous rash in the pattern of a “bull’s-eye”, which manifested at the site of a tick bite. Lyme disease patients who are diagnosed early, and receive proper antibiotic treatment, usually recover rapidly and completely. A key component of early diagnosis is recognition of the characteristic Lyme disease rash called erythema migrans. This rash often manifests itself in a “bull's-eye” appearance, and is observed in about 80% of Lyme disease patients.
Text: CDC