I had protected sex with a friend and received unprotected oral sex sometime in April. Early part of Oct I started to notice a large canker sore back of throat and it got better about 5 weeks later and another canker sore developed on the other side of throat. Now I have acid reflux and just wasn’t sure if this could be an std. the cankers sore just taking along time to heal. Thank you and if I’m on the wrong post please let me know where I can go and ask this question.