Hello, I'm following up on my exposure from 4/6 (protected/semi protected receiver of oral from female by saran wrap at massage parlor). I was tested on 4/27 for Syphilis, Gonorrhea, and Chlamydia, which were all returned as negative. I know that Syphilis isn't conclusive and that's my main concern and reason for this follow up. I have a large red bump on the back of my thigh, but it doesn't look conclusively as a syphilis chancre. I also have developed a serious rash on my anus and I'm not joking, it's very large and very red but can't tell if any chancres exist (just very red and sensitive to touch) but hard to tell by taking pictures. I'm getting tested again on 5/10 for HIV and Syphilis. My main concern as mentioned is Syphilis, so here are my questions: 1) Does the sore on the back of my thigh and rash on my anus indicate Syphilis? 2) Can Syphilis be passed through massage from someone (she rubbed my anus quite vigorously)? this is outside of oral exposure concern. 3) Will my test on 5/10 be conclusive? It will be one day short of 5 weeks from exposure, what's the percentage of accuracy? What could this red sore be on my leg and rash on my anus? I have also had a partially sore throat, fleeting headaches, and some muscle/bone aches recently. Thanks in advance. 

Also, is the HIV test that I will take at 5 weeks conclusive? How accurate will it be at 5 weeks compared to 6? I'm not sure which ones my clinic uses.

Welcome back but I'm sorry you found it necessary. My first comment is to point out one of Dr. Hook's comments a couple days ago:  "Please don't overthink this. When your results are negative fro gonorrhea and chlamydia, I would encourage you to put your fears aside and move on." That remains my advice as well, especially about overthinking:  that's what is reflected in these questions.---
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Sorry I neglected your HIV test question. This was definitely a zero risk event for HIV; there has never been a scientifically proved case of HIV transmitted oral to penis, and it is also very unlikely your partner has HIV. But here too, if you insist, wait until testing is conclusive -- which is 6 weeks for the standard AgAb (4th generation) HIV blood tests.---

I appreciate your bode of confidence in a time when you can tell I'm lacking. However, a few questions remain. 1) How accurate are the Syphilis blood tests at 5 weeks; 80%? Would I test positive if the symptoms I'm mentioning happened to be from Syphilis? 2) Is the HIV test at 5 weeks 90% accurate? I understand 99% at 6 weeks. 3) She certainly did massage my thigh and asshole as mentioned in first question/comment, but I'm assuming this doesn't change your advice at all. I have to test at 5 weeks due to conflicts and continuing delay of sex with my regular partner is becoming rather difficult, which I know you advise against, but I will likely take my 5 week results as conclusive after your advice.  

1) No solid data exist, but probably ~90%. And yes a negative result would show your symptoms are not from syphilis.---
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Thanks, Dr. Handsfield. Since I'm spiraling with my anxiety I'll finish it off with one last question then feel free to close. Do most Planned Parenthoods use the HIV AgAb tests? and use Syphilis tests that would show up as positive roughly 90% of the time at 5 weeks? I want to be as sure as possible following the testing, but I'm going to do my best to quit worrying, the mind is a weird thing. Thanks for helping out. 

Most clinics providing routine HIV testing use the AgAb tests regularly and I imagine most PP clinics do so -- but you'll have to ask them.---