My son has always had problems with allergies and even had HUGE tonsils. Even when he was healthy, they almost touched. He had them removed.
He developed an enlarged lymph node on the right side of his neck towards the shoulder and back of his neck. I had it checked to be sure it wasn't anything serious.
My suggestion is that any time you have an enlarged or swollen lymph node, it's best to have it checked by a doctor.
Good Luck!! And let us know what you decide.