Hello, I am from India, 2 days ago I had protected oral and vaginal sex with a CSW. For each sex I used a new condom. So I'm not worried about any other stds except syphilis as I noticed a square shaped (I can't remember the shape exactly) irritated and red spot with some round rash like pimples right after having sex. It was on her left leg right above her knee. I don't know if I touched it or any part of my body came in contact with that area of her body. As I am afraid it was possibly syphilis what are my chances of catching syphilis from this incident? I noticed nothing around her genetial.