Hello Doctor. I have a question. I did oral sex to a male (I am a male too) but it only lasted less then 1 minute since I got scared. He did not have any warts, sores or lessons. He had washed his part right before the act.They I went May 27th on a trip. On this trip I ate a hot food but not in the matter of burning myself. I am worried I have a STD. The ulcer came in May 28th threw the afternoon when I ate, it is at the top of my mouth right behind my front teeth. I still have it but less swollen, it hurts and sometimes tingles. A few hours back I was eating and hurt myself with a french fry. (maybe related to tingling? Didn't do this before) Tho, I do not have a fever, cold, or any other symptoms. I am very worried. I did ask him and he said he has never had an std nor any symptoms since I sat down with him. What is your opinion about this, thank you.