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Lyme disease, erythema chronicum migrans

Lyme disease, erythema chronicum migrans

Overview

Erythema chronicum migrans is the initial lesion of Lyme disease, and often appears at the site of the infecting tick bite. It is a red, enlarging rash, flat or slightly raised, and may reach from 4 to 20 inches across (the average rash is 6 inches). (Image courtesy of the Centers for Disease Control and Prevention.)

Update Date 2/27/2012