The hallmark of acute infection with Lyme disease. EM is an expanding red rash with a sharply defined border and (typically) central clearing. The rash usually appears within 3-32 days after a tick bite. The center of the rash is the site of inoculation. The causative agent is Borrelia burgdorferi, a spirochete that may later invade the joints, the central nervous system, or the conducting system of the heart.
The initial indication of Lyme disease in most individuals often manifests as a crimson cutaneous eruption, displaying a vivid redness on the skin surface. This particular dermatological manifestation holds significant importance as it frequently serves as an early sign of the aforementioned medical condition.
Erythema migrans is a red, round rash that develops due to a Lyme disease infection. Initially, it manifests at the location of a tick bite from an infected tick. Over days or weeks, the rash gradually enlarges to create a sizable, circular patch. This symptom is most frequently observed on the thighs, groin, trunk, or under the armpit.