erythema migrans
noun
erythema mi·grans
-ˈmī-grənz 
variants
or erythema chronicum migrans
: a red spreading annular skin lesion that is an early symptom of Lyme disease and that develops at the site of the bite of a tick (such as the deer tick) infected with the causative spirochete
Examples of erythema migrans in a Sentence
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Blood tests are also only about 50 percent accurate, even in patients with the telltale bullseye rash (erythema migrans), further complicating the treatment process.
—
Jennifer Sala, Discover Magazine, 16 May 2022
In 70-80% of cases, the CDC also reports that people will experience an erythema migrans (EM) rash—a rash that typically in a bulls-eye shape, feels warm to the touch, and gradually expands over the course of a few days.
—Maggie O'Neill, Health.com, 8 Sep. 2020
That’s especially true if patients don’t have the bullseye rash— known medically as erythema migrans—characteristic of Lyme disease.
—Carrie Arnold, Popular Science, 28 June 2020
Typical symptoms include fever, headache, fatigue, and a characteristic skin rash called erythema migrans.
—Rosy Cordero, EW.com, 8 Jan. 2020
Then, an ecologist doing field studies saved the tick that bit him where an erythema migrans formed.
—Allen Steere, BostonGlobe.com, 22 Aug. 2019
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Jennifer Sala, Discover Magazine, 16 May 2022
In 70-80% of cases, the CDC also reports that people will experience an erythema migrans (EM) rash—a rash that typically in a bulls-eye shape, feels warm to the touch, and gradually expands over the course of a few days.
—Maggie O'Neill, Health.com, 8 Sep. 2020
That’s especially true if patients don’t have the bullseye rash— known medically as erythema migrans—characteristic of Lyme disease.
—Carrie Arnold, Popular Science, 28 June 2020
Typical symptoms include fever, headache, fatigue, and a characteristic skin rash called erythema migrans.
—Rosy Cordero, EW.com, 8 Jan. 2020
Then, an ecologist doing field studies saved the tick that bit him where an erythema migrans formed.
—Allen Steere, BostonGlobe.com, 22 Aug. 2019
Cite this Entry
“Erythema migrans.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/erythema%20migrans. Accessed 30 Oct. 2025.
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