Am I at STD risk - mainly syphilis

Around August 27/28 2012 I gave a man protected fellatio with a condom on for about 4/5 mins, he didn't ejaculate at all and I sucked on his scrotum for less than a minute around 3/4 seconds. After that I stopped and left so there were no fluids or anything and he didn't have any sores on his scrotum.

I was just wondering did I put myself at risk of STD specially syphilis?

Like a week or two weeks ago, I had a small cold sore on my right upper lip, cold sores are normal, I get that when I'm about to fall ill. I was ill for about 3/4 days. After a while I had a ulcer on my bottom inner lip, it was really small, painful when my teeth touched it or when I was drinking tea or if i poked it with my tongue. It was white in the middle and a few days later it disappeared. I'd say less than a week.

Is that anything to worry about? Can syphilis be passed without the sore being there? what is the difference between syphilis ulcer and normal mouth ulcers?

[gracefromHHP]

we recommend protected sexual contact for a reason - it works!!

protected oral sex is not a risk.

grace