My ds had this - it went away on it's own when he was a few months old. If I remember correctly we ruled out hernia with an ultrasound and then left it alone, I think?
I checked my old posts on my old DDC and found this at 9 weeks old:
So we have to have an ultrasound tomorrow morning because one of Cully's testicles still isn't palpable, and he has a hydrocele on that side, so our dr suggested an ultrasound to rule out a hernia, since he had an inconsolable few hours of crying. She agreed that the abx were probably the culprit, but just to be on the safe side she wants to rule out hernia, so we're doing that tomorrow morning.
and then this:
Well, Cully has a hernia (inguinal hernia) and will probably be having surgery at some point in the very near future.
He was so good during the ultrasound, just cooed the whole time. Waiting for a call from the dr....
But it did go away on it's own, no surgery. Hope that helps you a bit.
Em, married to Alex, mom to Samantha (11 yrs) and Cullen (5yrs) and Maybe (5/16/2010) Trying to grow 4,000lbs of produce on .2 acres. See my blog!