Mine son has it to and I think I had the same answer from the Dr. It could also be a phatty cyst. No wories, the Dr said it is ok and not in a bad place. My daughter has one above her eye brow and was removed when she was an infant. Ofcourse you can always go and get a second opinion.
They do sound like Lymph nodes, feel your own they do move,I have always found that if you are worrying about something especially with kids health find out all you can ask questions, yes if you are not Happy with the Docs answer go to someone else.Are the Kids well in every other way is their health good , have they other symptoms?.