I stayed in a hotel today and got free toiletries. I used the cup provided by the hotel, but recently I have oral ulcer and aphtha, and I feel bad after using the cup.

I'm not sure, but AIDS is not so easy to get infected. Usually through sexual contact, mother-to-child transmission, some drug users share drug paraphernalia. What's more, if someone had been infected with AIDS because of this hotel before, this hotel would have closed long ago. For the sake of health, try not to use these things when traveling in the future. You'd better take it with you. If you are not at ease, I suggest you go to the hospital for a check-up.