Differences between herpes sore and primary syphilis sore?

This is a cross-post (I originally posted in the STD forum, but hopefully there's someone here with experience with both herpes and syphilis that can help me:

Is it possible to tell the difference between a herpes sore and a primary syphilis sore?  I have genital herpes, but I had a very very brief oral encounter ( I had my penis sucked for about 3-5 seconds) before I pulled out and cleaned with soap and water.

I am concerned with 2 sores, which I'm almost sure are herpes (I was itchy first, then they came up) around the same part of my penis that I had just gotten over a herpes outbreak.  They are very small, and look a tiny bit dimpled.  They are probably just another herpes outbreak, but I'm scared it's syphilis.

Are there any obvious differences between the two?  I'm not just talking about googling images, because some of them look very similar.  I'd like to know if anyone here could verbalize the differences, if possible...

Is one bigger than the other?
Does a syphilis sore cause itchy skin before it presents?
Can you get more than one syphilis sore?
Do syphilis sores scab at some point?
Compared to herpes (which I have), does syphilis bleed, ooze, get sticky, etc?

If anyone can help verbalize the differences, and perhaps assess my risk with the above encounter, I would appreciate it.

Thank you.

[petal130]

3-5 seconds of oral sex and you're worried? Did the girl have a syphilis sore on her mouth? How on earth are you going to have any sexual relationships moving forward, if that is enough to make you worry as such?

From the CDC website:
"The time between infection with syphilis and the start of the first symptom can range from 10 to 90 days (average 21 days)." Here's the link in full, regarding transmission, symptoms, etc. http://www.cdc.gov/std/syphilis/STDFact-Syphilis.htm

I have genital herpes, and I'd say "dimpled lesion" accurately describes what can be a herpes lesion.

Ultimately, getting things checked out by your medical provider would be the thing to do if you're concerned.

[goodguy180000]

petal130, it was a man, so I would assume high-risk, as far as STDs go.  Anonymous internet hookup, etc...  My anxiety is way up compared to meeting a girl and starting a relationship, etc...  It really was at most 10 seconds of being in his mouth before I got scared and pulled out.  I didn't see any obvious sores on his mouth, but there's no way to know if he had anything going on in his mouth.

Online images of some syphilis lesions look a lot like herpes.  I think these came a 5-8 days after the encounter... I can't remember.  It's been 25 days now, and I've had these lesions for at least 2 weeks, maybe more.

I am just concerned because I don't know if this is just another herpes outbreak - you'd think I'd know by now.

Thanks.

[goodguy180000]

Do you (or any regulars here) think that this exposure would warrant testing?

Thanks.