Erythema migrans

Erythema migrans or erythema chronicum migrans is an expanding rash often seen in the early stage of Lyme disease, and can also (but less commonly) be caused by southern tick-associated rash illness (STARI). It can appear anywhere from one day to one month after a tick bite. This rash does not represent an allergic reaction to the bite, but rather an actual skin infection of one of the Lyme bacteria species from the genus Borrelia. The rash's name comes from Neo-Latin for "Redness migrating."

For the tongue condition also sometimes called "erythema migrans", see Geographic tongue.
Not to be confused with erythema multiforme, despite that both often involve target lesions (but from different causes).
  • In Europe, 80% of Lyme rashes look like a "bull's eye," but in only 20% of cases in the United States. (20 percent of Lyme infections show no rash.)
  • Erythema migrans ("redness migrating") and may have no definite pattern, as in this Lyme rash on a woman's neck. Rashes from non-Lyme causes may look similar.
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