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The information contained on this page is provided as general health information and is not intended to substitute as medical advice and direction from your physician or health care provider. Please direct any questions related to your health care provider. In an emergency, call 9-1-1 or go to the nearest emergency center.


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.)

Lyme disease, erythema migrans