Now, I am jumping ahead of myself here but DS had had this twice (which I know isn't particularly unusual) and had anti-biotics each time. The Dr mentioned this time that he may need an operation. I am assuming that he doesn't mean a full circumcision but perhaps just a trim. He is 4.9 and has what seems an excessive foreskskin, I would say that without stretching it, it hangs down nearly a centimetre. The Dr told us that we have to pull it back to clean it so I am just in the process of teaching DS to do it. He isn't generally a willy fiddler.
DS2 also has a similarly long foreskin.