I just wanted to add that I am in the same situation now. I have a swollen node on the same side, just under the surgery site. It has been there for a long time. After two follow up visits with my Mayo Doc, he says not to worry. He thinks it is just the result of all the trauma from surgery, etc. He didn't feel like a biopsy was necessary either. I do trust the doc, but it makes me nervous as heck if you want to know the truth.
Anyway, I just wanted to let you know that you are not alone in this one.
Take care,
Amy from MN (where we have finally packed away the parkas for the season)