Visit a doctor: A lump on your armpit could be a lot of things: like your body's reaction to an infection (your lymph nodes will swell up), a bug bite or something more. Risk factors for this being something serious are: if it is only on one side; if you don't have an infection; you don't remember any trauma there. Visit a doctor and be prepared to answer questions about family history of major illnesses.
Answered 12/20/2012
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