Actually many lymphoma nodes are rubbery...not like a pebble hard. They are generally over 2 cm. Just because you can feel a node doesn't mean it's abnormal. Just because it's enlarged, doesn't mean it's lymphoma. Nodes often flare up, then some never fully go back down as they set up some scar tissue. The VAST majority of these nodes that are biopsied do not show lymphoma. With that said, yes I would get a second opinion as it's my belief any node larger than 2 cm that hasn't gone down should be evaluated. The encouraging thing here is you are only complaining of one node, no systemic symptoms, and you are not complaining of the node growing. My guess? You probably had a little virus a bit back...noticed a lymph node then started playing with it. HA'rs love to play with lymph nodes and this keeps them chronically inflamed then they scar down.