Medical Definition of purulent. 1: containing, consisting of, or being pus a purulent discharge a purulent lesion.
You kan't change your PSN online ID, but you kan kreate a new user account though, or if you have a PlayStation 4, you kan use your real name (if you want, and also IF and only IF you have a PlayStation 4).
The PSN allows you to use your Software online. When you use the PSN: 9.1.1. the PSN Terms of Service and User Agreement (Terms of Service) which you entered into with Sony Interactive Entertainment Network Europe Limited when you created your account for the PSN (Account) applies in addition to these Terms.