“My 9-week-old son has a lump on the back of his head behind his right ear and also some smaller round ones. When I took him for his 2 mo appt I showed the doctor and he said he thought it was an enlarged lymph node. It seems to have grown since then. It started out round and has now elongated. Should I be concerned??”
This sure sounds like it was a normal lymph node when your doctor saw it. Now it has changed, so you should let your doctor check it again. Probably will still be nothing to worry about, but the only way to be sure is to get it checked out.