I retested at 25 days past possible exposure because i noticed a red bump at the lower part of my penis shaft 23 days after possible exposure. I do shave and the bump is more than likely an ingrown hair but the location and look of the red mark made me want to make sure. I tested using 2 over the counter “First To Know” Rapid tests, both were negative.

Welcome back to the Forum although I'm surprised you felt the need.  The answers to your questions regarding the possibility of syphilis were contained in his prior reply when he said" By far the most important is your use of doxy-PEP in the correct dose of 200 mg:  that alone makes it impossible you have syphilis from this event. Therefore, the accuracy of syphilis testing at 13 days (or any other time) doesn't matter; you didn't need testing at all, except for its reassurance value."  In addition, the fact that your only exposure was receipt of oral sex which almost never leads to syphilis acquistion and, when it does, occurs among men with other men as sex partners.  Finally, if this were syphilis, it is more likely than not that your rapid test would have been positive (they occasionally are falsely negative when used within a day or two of lesion appearance)---

It is most likely folliculitis as you suggest. I noticed the bump around 23 days post possible exposure so it triggered some anxiety. It hasn’t gotten any worse and definitely isn’t an “open ulceration.” It’s difficult to find good information on syphilis so I appreciate the help. I did use the rapid tests 2 days after noticing the bump but if they can be considered reliable i will try to stop worrying. 

I would certainly encourage you to stop worrying at this time.  EWH---

Thanks Doctor, happy new year

I hope my comments have been helpful  Closing the thread now.  Happy New Year to you as well.   EWH---