C.O.
R.:
Welcome to mamapedia!
First - change your title so that you will get more people to answer your question to something like "nodules on the side of 1 year old neck"
The lumps you see on the side of his neck are lymph nodes. They should NOT hurt him should move around a little bit.
They are enlarged as his body is fighting off an infection. My 10 year old son has lymph nodes that get so enlarged they have SOMETIMES looked like the side of Frankenstein's neck!
How do they go away? When the body is finished fighting whatever it is he is fighting. Ensure he drinks plenty of water and liquids to help flush his system out.
Good luck.