My 15 week old pup developed what I though to be an infection under his foreskin. I could see small amount of discharge (puss) at the tip of his ______

. I took him to the vet as he was due his 15 week shots and first rabbies vaccination anyway. The vet said, don't be alarmed as this is very common in young male pups and all was well. I initially thought that some debris had logged itself between his _____

and foreskin that become infected, but the vet found no signs of this and just passed it off as a point of entry, where germs, bacteria and the like enters the body. Now it's four days latter and it's still there and really starting to bug me. Has anyone else ever experienced this and do I need a second opinion? Thanks