Swollen armpit lymph node

Hello, 

 

im new to the sight and hoping for some reassurance! I have had a swollen lymph node in armpit for 5 months now, I got referred to the breast unit when I first found it. They did ultra sound and said it was a superficial lymph node and were happy. Since then it has got bigger (maybe because I'm constantly touching it) it's around 1cm in size and quite firm I've been back to my gp again today and she has put another referral in and wants it biopsied, which I am so pleased as I need to know for sure what it is. 
 

any similar experiences would be great to read. I have no other symptoms at all.

 

xx