A week ago I got a blowjob and a brief rimjob (15 seconds maybe) from a stranger of unknown status. About 2 days ago I developed a rash in that area. It’s only mildly uncomfortable and does not hurt when I have a BM (does hurt while wiping if I penetrate). No blood. It’s a circular rash. Any chance this is HPV or Herpes from my encounter?
In two days? On your anus? No, that's not likely. More like a fungal infection or maybe a bacterial infection that could be cured with common over-the-counter creams. If it doesn't go away soon, consult a doctor.
I misread and thought you meant the symptoms happened after 2 days. But no, it doesn't sound like an STD and 15 seconds of licking isn't likely to transmit anything at all.