25 (male). 7 weeks ago, I had an exposure with a CSW. Received protected oral for 4-5 minutes and kissed the breasts, nothing else. From what I’ve read, this is all low risk, but 2 weeks later, my wisdom tooth became inflamed, which is partially covered by the gum. My dentist prescribed 1 week of Amoxicillin 875 mg + Clavulanic Acid 125 mg two times a day for 1 week. After finishing the antibiotics, by the 4th week, a 5-6 mm red, round, painless spot appeared on the inner part of my lower lip which slowly became slightly raised but still doesn’t hurt. Its surface is almost flat, and it looks like it has very small red dots or radial lines in it, with a color similar to the rest of the lip, but it feels slightly firmer to touch and has 1-2 whitish areas at the border. On the upper lip I have a small 1-2mm mucocele i think. Now it’s the 7th week, and it’s still present but has slightly retracted. There is no ulceration, but from the whitish area, I think I see a small transparent fluid drop (oozing?). I did a rapid test after the antibiotic treatment and again at the beginning of the 7th week, and both were negative, no palpable lymph node. My question is whether the antibiotic treatment could cause a negative result and later turn positive (delay?), when should I retest, and whether this bump could be more likely related to the tooth inflammation and antibiotic therapy rather than syphilis.

No, there was no lesion. Yes, the rapid test was for syphilis, and it was negative 7 weeks after. I just have one last question to clarify. Are there doses of antibiotics that can delay the test from becoming positive ? I read that sometimes you need to wait 3 months after taking antibiotics, or did I misunderstood? Thank you for your response!