Can this be ignored?

I was diagnosed with stage III breast cancer in 2007.  I had 33 lymph nodes removed, 7 of which were positive.  I have had lymphedema in my left arm since 2008.  I have noticed a knot on top of my shoulder near my neck, above my collar bone on my left side.  It is about the size of a ping pong ball.  I have asked my oncologist if this is a lymph node or just the swelling moving higher, but I never get a straight answer, just a "hmmm..."  It concerns me that this could be a problem being ignored.  Any suggestions?

[SueYoung55]

My sister had one of those and it ended up being non hodgkins lymphoma, stage 4. After chemo she is cancer free.

Regardless of what it is, as a survivor they should never ignore anything like that, period.

I'd tell them to refer you to a doctor who is willing to check this out since they haven't.

Best wishes. Here's hoping that it's nothing at all.