A lump in the armpit caused by a generalized viral infection will eventually disappear without therapy. A lump in the armpit caused by an allergic reaction will go away after the provoking substance is removed. No treatment is necessary for a lump in the armpit caused by normal breast tissue, and usually no treatment is necessary for a cyst . For a lump in the armpit caused by a malignancy , follow the appropriate cancer treatment recommended by a doctor. Do not try to diagnose lumps without professional help.
Testing depends on what is found during the physical examination.
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