About 8 months ago, I submitted a question about the risks of an encounter I had with a transexual CSW (Question #7977).  I got tested after this event and put it behind me, but have recently developed an a light itchy rash on my shins and left arm that has me wondering if i should be tested one last time.

Here is my situation:

• I performed unprotected oral and received protected anal sex from a transexual CSW on June 4, 2021
• I was tested for HIV, Syphilis, Hep B/C, Chlamydia, Gonorrhea, and Herpes 3 weeks later on June June 26. Everything was negative
  
• Because I can't do math, I had a follow-up set of test for the same 5 weeks and 4 days later (not the full 6 weeks recommended for Syphilis).  Again all was negative.
  
• I never developed any chancre or a rash that I was aware of.
  
• On Feb 25, 2022 (8 months after my possible exposure), I developed a light itchy rash on my shins and left arm that hasn't gotten very bad but still hasn't gone away 

Welcome back to the forum. I’ll be glad to comment. The exposure you describe is very, very low risk for acquisition of syphilis or, for that matter any other STI. Syphilis is very, very rarely transmitted through oral sex and condoms are highly effective for prevention of syphilis following exposure in other sites. You have not developed a chancre or other lesions. Your three week tests were strong evidence that you have not acquired syphilis and your close to six week tests are definitive.  A few days makes little or no difference, particularly following a low risk exposure of the sort you describe.---

Thank you for the response. That information clarifies the situation for me. 

Glad I could help.  EWH ---