luvmyhubby,
What the others have said is accurate. It could be many other things causing it to appear different including the normal healing process. Your diligence and attention to detail is certainly a benefit to Dan. He is lucky to have your love and support.
I am impressed that it was mentioned. In many reports that I have come across remaing nodes outside of the surgical area are not even commented on. If you are concerned and want clarification ask one of the docs. It is, in my opinion, being monitored which is a good thing.
My thoughts and prayers are with you.
Cheers,
Mike