I had unprotected oral sex 18 days ago, and i noticed a small bump under my testicals, at the very bottom. It might be ingrown hair (It hurts when i touch it), but its solid, small and round. My question is when i had unprotected oral sex, testicle especially the bottom of my testicles were never exposed to any sexual activity, it was just my penis that was exposed. In this scenario, Where does the syphilis chancre can form? If i had contracted syphilis through my penis, is there any chance for Chancre to show up underneath my testicles, or it would show up at the exact spot where the syphilis sore came in contact with? Thank you for whoever would answer my questions. I really appreciate it.