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i have a lump in my left armpit,which i believe to be benign, for 2 years already how would i know if it is becoming malignant?

Posted by she

the lump is about 5mm in diameter and it was not painful until when i was about to have my monthly period last month. i noticed it became a little swollen and a little larger. it did subside few days after my period. now, i am expecting my period and the lump had swollen and doubled its size again but this time its surface is flat. any idea what could this be? 
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