Merck Manual

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The Bull's Eye Rash of Lyme Disease (Erythema Migrans)
The Bull's Eye Rash of Lyme Disease
The Bull's Eye Rash of Lyme Disease (Erythema Migrans)

Sometimes in Lyme disease, the rash (erythema migrans) resembles a bull's eye. It consists of a red spot in the center, surrounded by a pale ring, which is surrounded by a red ring.

Image courtesy of James Gathany via the Public Health Image Library of the Centers for Disease Control and Prevention.

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Lyme Disease