Was showering and I notice my upper side lip where lip touches was swollen and felt uncomfortable. When i checked in the mirror. It had a white head. There's no cluster. I assume it has burst from me licking it due to discomfort. I googled my symtom and cold sore keeps popping up. Does herpes always show up in a cluster? Or like a pimple just by itself. It's like an open wound now. And I'm freaking out. Had my last encounter a month ago. Didn't gave her oral but we kissed. Hope to get a reply. In really freaking out.