Is he having any other problems? Swollen lymph nodes could mean a number of things. Sometimes people get them with a common colds, URI's, strep throat, tonsillitis, etc.

It would be the smart thing to do to get it checked out and make sure there's nothing underlying.


*edit* Just googled it for you, and here's a website explaining a bit about it.

http://www.nlm.nih.gov/medlineplus/e...cle/003097.htm