From some time I am witnessing a Painful Lump In Armpit that is causing some sort of worries into my mind. Although its not that malignant into its effects till now but who knows if it grows by time. I have learnt that Cancer could also be one of the causes of it, is it true? Can somebody let me know about different causes of Painful Lump In Armpit. If you suggest me some quick treatment of it, will be highly appreciated.