If you got a COVID-19 vaccine and you developed a swollen red rash at the injection site several days later, then you might have gotten “COVID arm.” This annoying (but ultimately harmless) coronavirus vaccine side effect is something researchers are now beginning to understand a little better.
The symptoms of what is colloquially known as COVID arm include redness, swelling, and tenderness at the injection site that develop eight or more days after getting the vaccine, according to a new report in the New England Journal of Medicine. Looking at phase 3 clinical trial data for the Moderna mRNA vaccine, the researchers found that the reaction typically went away after within four or five days.
What Is ‘COVID Arm’? Researchers Are Finally Beginning to Understand This Vaccine Side Effect
