About ten years ago I had a lymph node under my armpit that was so big! I actually didn't notice it until I dreamed I was itching under my armpit, and in my sleep I felt it. Next morning I thought I'd dreamed it, and imagine my terror when I felt and THERE IT WAS! HUGE! Went to the doc..he looked at it, felt it, and said it didn't look scary to him, but if it bothered me, I could have it removed. STILL TERRIFIED. He had an ultrasound done - looked benign. I was still so scared, so I had it removed. The surgeon took it out, biopsied it, and it was benign. Both doctors said that OFTEN lymph nodes get big for no apparent reason. That was TEN years ago, and I'm fine. Have a lumpy scar under my arm where my lymph node used to be. I ignore it.