How large does a lymph node need to be swollen before you should see a doctor? The other day I noticed a really small (by small I mean about not even the size of a bb pellet) enlarged lymph node in the side of my neck. At first I thought it was a pimple because it wasn't that elevated but then if I really press pinch my skin together and feel at it I could feel a distinct pebble like object I'm guessing maximum 1/8" in diameter if that. It's not obvious looking at it directly either.