Vance is correct... unless you already entered secondary stage of Syphilis some time ago and are in the third (silent) stage.
Either way, it doesn't hurt to get occasionally tested for Syphilis (since it's been making a comeback for years now).
Yes, start with a canker at about 21 days, rash would not be for months after.
are you sure? it really worrying me.
No that would not be syphilis.