STD OR JUST INFECTED AFTER FRICTION?

So on thursday night I offered to give my bf a blow job since I’m on my period and I wanted to please him, and I my goal was to make him cum so kept sucking for like 30 minutes maybe and my mouth was a little sore but I kept going but wasn’t able to make him cum, and so in the morning my mouth kind of hurt and I looked in and seen two white lines on both sides of my mouth felt like rigid skin but went away already and I also had like a line under my top lip that hurt too and was a little red and felt rigid so I was thinking it was most likely because of the friction and my teeth that possible made these cuts or whatever and now it’s Saturday and I still have the one under my lip and it turned into this..... idk if it just got infected or it’s a std. I doubt my bf would ever cheat on me but I’ve never had this from giving him blow jobs, then again I’ve never given a blow job for that long. I’m also pretty sure it’s from forming my mouth like a cup for a while too but has anyone had this before?