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Is this a chancre?

Hi,

About 11 weeks ago I had protected sex and protected oral with someone whose sexual history I'm not familiar with. Couples of weeks later, I developed this (see photo here: http://www.photobox.co.uk/my/photo?album_id=3486944928&photo_id=20770514729#20770514729).

I tested for syphilis at 10.5 weeks (both VDRL and TPHA/TPPA) and they came back negative. I also tested for HIV with a combo test at 10.5 weeks and it came back negative as well. I tested for Gono, Chlamydia etc. earlier (around 3 weeks post exposure) and they are all negative?

Could this ulcer be STD-related? What does it look like, doctors? Does it look like a chancre, a wart? Signs of HPV/herpes? Could it be something else?

Thank you
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Avatar universal
We do not look at pictures, please see a Dr for an exam. Skin issues can't be diagnosed online or even given an idea.
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Avatar universal
Sorry if the link doesn't work. This one should

http://s6.postimg.org/g85hgt3fl/IMG_0399.jpg

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Avatar universal
No I didn't. What test should I go for? Does it look like herpes to you?
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Avatar universal
Did you test for herpes?
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Avatar universal
To add some details: it is near my anus. I am straight and never had anal sex. It developed about 3 weeks post exposure. Thank you
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