I had oral sex with the same sex last night and we had oral sex for each other. Among them, I once had a deep throat. My genitals are not damaged, and I won't ejaculate in my mouth. After that, I repeatedly asked him if he was infected with HIV. He insisted that he was very healthy and had no sexual relationship. After that, I brushed my teeth for about an hour. The inside of my upper lip is close to my nose, and I have a small oral ulcer. There is no bleeding, I may not touch it. I would like to ask whether the other party is carrying HIV in this case, and whether it should be tested and blocked.