K.S.
Hi J.,
My two year old son also has had a lump on the left side of neck. It seems to come and go and I was also concerned but I have brought him to my pediatrician and they don't seemed to be concerned. They said that it is simply a lymph node and all it means is that his body is fighting off something. They said they would be concerned if the lump didn't move when you touched it. He has been pretty healthy so I don't think you have anything to worry about:)