When a person has an infection, they may notice swollen lymph nodes in part of the body near the infection site, such as their neck, armpit ... Under the arm, it may indicate that breast cancer ...

Swollen lymph nodes can also be a side effect of certain drug classes that treat bacterial infection—such as Cephalosporins, Penicillins, and Sulfonamides. Swelling in the armpit can sometimes ...

The armpit, also known as the axilla, is the hollow area under the junction of arm and the shoulder ... within a few days and the lymph nodes will return to normal size within a week or two ...