Yeah I agree. Maybe you burned yourself or something, but it's not related to an STD.
Your question is if you got an std on your lip from smoking a joint with some guys? Well, 80 percent of the population does have HSV 1 (oral herpes) and you may have already had it. Oral herpes is generally a skin to skin contact transmission. If you didn't kiss, unlikely to pass. And no std shows up the morning after. So, I think you are just allowing your anxiety to work on you.