A week ago, I mutually masturbated with another male. I went to ejaculate on his face, but he put his mouth on the head of my penis to catch and lick the semen. It lasted about 5 seconds and then I pulled away. I then rinsed off my penis and attempted to rinse out my urethra.

Next day, I noticed a small, fleshy/purplish painless dot to the left inside of my urethra. It’s been the same size since then. I do have a prince albert piercing, so I’m wondering if I put it back in too forcefully.

I went to urgent care just under 72 hours after with UTI symptoms. I now believe those are likely due to bad anxiety (urge, mild discomfort, perineum aches). No discharge or external lesions. They gave me doxycycline for 7 days. Urine test for g/c and a culture came back negative. Maybe a bit early, but can those be trusted?

Please share your thoughts on STI chances (especially HSV/HPV) and the dot? Think I can continue sex with my partner given these circumstances?

I'm not sure what you mean by "UTI symptoms".  Urinary urge and perineal aches are not suggestive of either a UTI nor STI.  Your negative test results provide further evidence that you were not infected and should be believed.  

Concerns about HPV and HSV are totally unwarranted.  Nothing you state suggests either of these infections.

I would have NO concerns whatsoever about having unprotected sex with your regular partner.

I hope this assessment helps.  I would not worry.  EWH

1.  I agree that the symptoms you described are more likely due to anxiety than an STI.

2.  Yes, I am in confident that your test results are accurate.

3.  I would anticipate that there is a 99.9% or greater probability that you did not acquire herpes from the exposure you describe.

I encourage you to move on. EWH