It is not uncommen for a little amount of swelling and pus so soon after a new peg tube. It takes the site a little time to get used toe the foreign body (tube) being in the body. Normally it will calm down with time and the pus dries up. You can have a absess in the site, depends if the puss is able to leak out of the wound on it's own or whether a collection has formed. The best prevention is regular cleaning and keeping the site protected especially in the first few weeks,

Procy