Courses of treatment will come down to your physician's individual diagnosis of the armpit lump. If a bacterial infection has caused the lump, it can be treated with a steady course of antibiotics. If the lump doesn't start to disappear, your doctor may either change the oral antibiotic or admit you to the hospital for intravenous antibiotics. For the most part, lumps are benign and therefore don't require any treatment whatsoever.

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