![](http://up.wiki.x.io/wikipedia/commons/thumb/0/01/Erythema_migrans_-_erythematous_rash_in_Lyme_disease_-_PHIL_9875.jpg/166px-Erythema_migrans_-_erythematous_rash_in_Lyme_disease_-_PHIL_9875.jpg)
The pathognomonic erythematous rash of Lyme disease is called erythema migrans. It has the pattern of a “bull’s-eye”, which manifested at the site of a tick bite on this woman’s right upper arm.
Photo credit: James Gathany, United States Centers for Disease Control and Prevention (public domain)
erythema chronicus migrans