Erythema Migrans Information and Treatment 

Erythema Migrans is a complication normally known as erythema chronicum migrans skin lesion that typically begins as a red macule or papule and expands over a period of days to weeks to form a large round lesion, often with partial central clearing. This is the rash that is associated with early Lyme disease. It usually occurs 3 to 32 days after a tick bite.

Erythema migrans is an expanding red rash, usually round or oval in shape, but differing greatly in size and appearance. Although the rash often extends to several inches or more in diameter, it can also appear much smaller (the Lyme bacteria have been cultured from EM rashes less than 5 cm, termed "mini EM").

Erythema migrans is the hallmark of before Lyme disease, seen in 70% to 80% of all cases, lead author Dr. Martin Glatz and colleagues, from the Medical University of Graz in Austria, note. Most people who get Lyme disease develop a red rash named erythema migrans (EM) within a month after the tick bite. The EM rash does not illustrate an allergic reaction to the bite, but rather an actual skin infection with the Lyme bacteria.

Symptoms starts as a red macule or papule at the location of the tic bite after a 7-10 day delay. Although the rash often expands to several inches or more in diameter, it can also appear much smaller. Characteristic medical feature of Lyme borreliosis occurring in about 90% patients infected with Borrelia burgdorferi transferred to humans by the bite of tics from the genius Ixodes.