Bump on armpit: If the bump is beneath your skin it's probably a reactive lymph node. Do you have any sort of issue going on with that arm, a rash or small wound? Even a small thing such as an ingrown hair can cause a lymph node to expand. Very unlikely it's cancer. Most cancers are painless early on.
Answered 6/29/2015
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A doctor has provided 1 answer
5 doctors weighed in across 2 answers
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