My son has lumps in his neck, too. I first noticed them when he was about 12 months and he is now almost 3.
The doctor told me that as long as they don't change in size, or if they don't cause him any discomfort, that they're completely normal. I forget what he said they were, but... I do remember him saying they were normal. Lol

I have discovered a hard lump on the back/right side of my neck a few weeks ago. It is painful and feels like a fist tightning inside. It radiates down my shoulder blade and back of my skull. I am very concerned and am going to the doctor tomorrow. The pain comes and gos, sometimes it feels like the lump goes down but then I can feel it like a hard knot of tension and it comes back. Does anyone have any helpful info. For me on what this could be?