It should be cold sore. Before I am pregnant, I frequently got the cold sore. Do you know why your whole mouth is full of cold sore? Your mouth is infected by virus right now. When you use lip balm, those viruses will spread to other areas of your lip. You just need to consult your family doctor (gerneral practitioner) not specialist. In general, they give you a cream and some antibiotics. Also, I would like to remind you that you don't use that lip balm again.
For me, I will not consult my doctor because those cold sore will recover by themselves.