Bump or lymph node?

Think of where Frankenstein's bolts would come out of his neck and this is where I felt a tiny, pea-sized cyst or bump on the right side of my neck. I'm feeling uneasy and don't know how to proceed. When I rub my middle finger over it (and I'm a small person), it feels very small, but I do notice it. I just saw my oncologist two weeks ago and am not due to see her until Sept. I don't think it's been there before, but any body change has me feeling more frightened. TU :-)