Most of the time, bumps in the skin of the armpit area are skin cysts, or areas of inflammation around the hair follicles. In some cases, armpit lumps can also represent breast lumps (in females) or enlarged lymph nodes.
It is impossible to provide a specific diagnosis over the Internet, and so if this lump persists or enlarges, then you should have your doctor evaluate you.
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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