Erythema chronicum migrans (New Latin, literally, "chronic migrating redness") refers to a 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).[1][2]

 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.










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