Can I rule out syphilis?

[biomedic]

Well so I've got this pus-filled sore on my inner prepuce next to the frenulum a few weeks ago (on 1 Aug).It's small, irregularly (a bit like a distorted oval) shaped, soft, had no raised/red border, and had intact skin below. The surrounding skin was red predictably. I got doxycycline 100 mg twice daily oral for 7 days, and chloramphenicol eye gel. It burst the morning after I first had the med, and bled a bit too.I noticed that it seems like only the top part of the skin (the thin, film-like transparent layer) was broken, and the underlying tissue had no erosion. The bleeding stopped very soon (in like 5 minutes, as you'd expect for a mucous lesion), and the whole thing went away in around 5 days. It came back like 5 days later, same spot but a bit smaller, and I put on the gel which made it disappear after around 3 days.
Prior sexual exposure: precisely 117 days before the lesion appeared I got an unprotected blowjob from a male friend of mine. I don't think he had any chancre on his tongue or his penis, and I haven't seen him having rashes typical of secondary syphilis.
I've been quite worried about the possibility of a syphilis infection. Does this whole thing seem like it? My GP said it looks like an infection from poor hygiene, but I didn't tell her that I've had unprotected blowjob before. I've never had anal or vaginal sex though. Would the time of possible exposure and response of the lesion to medication warrant syphilis to be ruled out? Thanks a lot in advance

[biomedic]

Thanks a lot. 6 weeks as in 6 weeks from exposure? Also, if I do have syphilis from oral sex, would that imply I am at great risk of HIV infection, despite it's oral sex only?

[Life360_Dave]

Hi. what your describing does not indicate a syphilis chancre for many reasons including the window period when it first appeared. But only testing at the 6 week mark would confirm if you have syphilis.