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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Most liekly your son had aviral infection.
That can cause swollen lymph nodes and can persist for several weeks.
Ebstein barr virus is one such example.
THis can be confirmed by the blood tests.
I will suggest blood tests --blood count with differential, EBV antibodies in this regard.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/