Are You Confident of the Diagnosis? What you should be alert for in the history Erythema migrans (EM) is the skin finding that characterizes early Lyme disease. It is the most common objective manifestation of Lyme disease and occurs in approximately 90% of cases. This lesion is so characteristic that it allowed for the accurate … Continue reading Erythema Migrans /Lyme Disease (Erythema Chronicum Migrans)