is 6 weeks enough for syphilis testing? and other questions.

[xx89xxyz]

6 weeks ago I had sex with a CSW. At the 3rd week because I got paranoid I took 2 grams of azithromycin in a single dose. At the 5th week I noticed a small, circular patch of skin peeling away but It's nothing like chancre pictures on the internet. It is completely flat, I can't feel the edges with my finger, no pus or any redness, it just looks like I peeled the dry skin while itching but It got me woried so 12 days later (at 6th week) I got tested for syphilis (VDRL and TPHA) which came back negative.

My question:

1. Could my antibiotic use may result in false negative?
2. Is it true that VDRL tests turn positive in 2 weeks after the chancre appears and conclusive results comes in 6-8 weeks. I got tested at the 6th week and also in the same time 12 days later after the chancre like thing appeared, so should I be worried?
3. Can chancre ulcers look like anything I described ? Google images seem to show the worst case possible.

Thanks

[gracefromHHP]

this doesn't really sound like a syphilis related rash. I'd go back and be seen again by a dermatologist.

[xx89xxyz]

yes but it's not a rash but more like upper layer of skin is peeled away. I'm dark skinned so it looks patchy. the scar was never open kind of wound, no indurated edges, just a very small peeling altough I made it big because I scratched it a lot to see what it was.

[gracefromHHP]

do you still have your rash?

honestly I wouldn't bother with more syphilis testing .

[xx89xxyz]

I've done the 8th week VDRL testing and it came back negative (this time without TPHA). I'm still nervous about my antibiotic use in the 3rd week because I think it might killed the bacteria but not enough to kill them all. I'm thinking about getting the 12th week test.

[Vance2335]

6 weeks is considered conclusive. Don't see a reason for testing again. But if you had a canker then your body would have antibodies and it seems rather late for a canker to show up.

[xx89xxyz]

I just saw a dermatolog for this, he recommended 8th week testing. About the peeling he said altough the size is consistent with the chancre it's not the usual presentation if it is, so I have to get tested again for 2nd time. He said something about upper layer of skin is peeled and nothing more..

[xx89xxyz]

yes it was protected

[gracefromHHP]

sounds like a fungal infection more than a std. have you been seen yet?

was this protected sex?

grace

[xx89xxyz]

I forgot to mension I was protected all the time.