According to doctors, the lump is a normal vaccine side effect.
According to Purvi Parikh, MD, an immunologist with Allergy & Asthma Network and a co-investigator on COVID-19 vaccine trials at NYU, swollen lymph nodes are normal and it actually brings good news, because it shows us that the body is building an immune response to fight the virus.
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Most of the time, the immune cells in your lymph nodes are activated after the vaccine, and the reason for which the ones located in your armpit tend to get swollen is because that area is the closest to the area where you received the vaccine, explains Purvi Parikh.
Even more, according to the U.S. Food and Drug Administration (FDA), people might experience “swollen lymph nodes in the same arm as the injection” for both the Moderna and Pfizer vaccines.
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