Yeah, I think if he has a fever you should see a doc ASAP before it interferes too much with him geting nourishment through the PEG.

I had what seems like a little bit of pus that started oozing from my site about 4 weeks ago and I put antibiotic cream around the site, washed it with those disinfectant wipes three times a day, and put a gauze bandage on it which I taped so it would stay close to the place where the tube comes through (normally I don't wear a bandage around the tube opening anymore--exposing it to more air seems to keep it healed better). The gauze seemed to wick out the puss over a period of a couple of weeks and, along with the cream and cleaning, I think I got rid of the infection before it got bad. But I never had a fever or a lump or bump. That sounds like it could be an absess to me.
Nelie