6-year-old with huge lymph node

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My son has a really swollen lymph node on the side of his neck, but only the one

side. It has been this way (as far as we know) since last week, going on 7 days

now. It does bother him when he eats because it is just below his jaw bone and

under his ear. It is pretty tender. I don't want to take him to the doc and

have any unnecessary tests done... but I am worried just waiting to see if it

goes down in size. I have looked in his mouth and throat, he doesn't have any

sores in his mouth, his throat is not red. His only symptom is the lump on the

side of his neck. I have 3 other small children who have colds right now.

Thanks in advance for anybody with advice!