hahah Now I think I get it...it was transferred her from the birds forum Sorry i didn't know we had one ...I wonder if it may be a bite he got maybe whilst out playing, could any t'shirt or vest be rubbing his skin and cause some inflamation ? Going to the clinic sounds like a good idea .good luck let us know what it is .
This is the pediatrics forum I have never heard of a birds forum,.. ..
It may be an injury (kids are always running and bumping into something) or it could be a small infection starting in one of the ducts. Only the doctor will be able to tell for sure.
By the way, this is the "bird" forum, not the pediatrics forum. I'll get your message switched and you'll probably get more information from other moms. Hope he feels better soon.