Lymph nodes: The most common cause of lumps in the armpit is swelling of the lymph nodes or glands that are always there but usually small. They usually grow due to infection such as a virus or a nearby bacterial infection (even in days). The best thing is to talk to the doctor about it. Sometimes the swollen glands are only in one area, and sometimes they are in several areas or "all over".
Answered 3/12/2019
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