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So blood doesn't transmit syphilis, direct skin to skin contact with a sore does.
If she had a sore on her lips or tongue, you could have gotten syphilis from the rimming. It doesn't matter how sloppy it was, or how bloody it was (don't let someone who you think is bleeding from the mouth put their mouth on you).
It was probably "sloppy" from saliva, not blood.
Syphilis doesn't cause body itching. It causes a round, painless sore that appears 10-90 days after infection. The average time for this to appear is 3 weeks.
The second stage of syphilis, which appears after the sore does, causes a rash on the hands, feet and torso. It doesn't just cause all over body itching.
If you are concerned about syphilis, which is uncommon in most developed countries (the US, UK, Canada, European countries, etc), just test. There is a risk here but it's not a big one.
You can get a conclusive test at 6 weeks.