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Check with your health care provider to determine the nature of the lump.
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For a lump in the armpit caused by an infected, painful gland, follow the instructions about the proper treatment for the underlying infection.
A lump in the armpit caused by a generalized viral infection will eventually disappear without treatment. A lump in the armpit caused by an allergic reaction will go away after the "trigger" is removed. No treatment is necessary for a lump in the armpit caused by normal breast tissue. Usually, no treatment is necessary for a cyst.
A lump in the armpit caused by a lipoma is harmless, unless it grows so large that it causes discomfort.
For a lump in the armpit caused by a malignancy, follow the appropriate cancer treatment recommended by a doctor.
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