Lyme disease - erythema migrans
Lyme disease - erythema migrans
Erythema 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 (12 to 35 cm) across (the average rash is 6 inches, or 17 cm). (Image courtesy of the Centers for Disease Control and Prevention.)
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