You can't talk me out of it, no matter how many "yes but" or "what if" questions you might ask. Move on. No more comments from me.
So having sex with someone who had 2 or 3 red bumps on the chest, which you avoided touching isn't really a risk even if some skin, in the chest area, may have come into contact with it and rubbed it. The risk is almost zero?
And secondary syphillis would be more widespread across the body right? It wouldn't just be 2 or 3 bumps.
No, with the possible exception of the secondary stage of syphilis (3-12 months after catching it). And you're not at risk of syphilis from the kind of exposure mentioned in your other thread.