Performing Oral with Canker Sore.

Does performing oral sex with a canker sore present a risk for HIV transmission? They say that if you have an open sore, or cut, and are performing oral sex, you are in fact increasing your risk for contracting HIV. I am curious as to whether there is truth to this theory? I do know that oral sex is very low risk, however, would performing oral with a canker sore (without swallowing or tasting any semen) be considered a risk for infection?

[Teak]

No.

[amazing87]

could you elaborate as to why some sites/advisors would point out that a canker sore is a suffice entry point to the blood stream, yet its pressence in the mouth upon performing oral sex doesn't put one at risk?