Erythema migrans
A rash in several vector-borne diseases / From Wikipedia, the free encyclopedia
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Erythema migrans or erythema chronicum migrans is an expanding target lesion or lesions, fading in the middle and spreading outwards from the center. E. migrans caused by lyme disease is often seen on the thighs, arms, genitals, nipples, in about 80% of early stage Lyme disease presentations. The chance of getting infected by a tick bite with lymes disease is very low, 3-12% in Europe.
In some parts of the world, EM can also (but less commonly) be caused by southern tick-associated rash illness (STARI).[4][5]
It can appear anywhere from 48 hours to 1 month after a chigger or 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 "migrating redness."