I felt a small ball the size of a dime on my 7 month old son s neck , the area where you would check for a pulse on someone, but on the right side instead of the left. I m taking him to his pediatrician tomorrow but as a mom I would like some kind of information on what it might be. He does have seasonal allergies and had a.small cold last week but it doesn t seem like where his nodes would be. Please help. Oh and BTW...It s not visible you can only feel it.