I also have a canker sore if my mouth if that's any relevance
Hi, if you work in the U.S. this would be a workman's comp issue and you have to report this to your supervisor right away. So if it happened today report it tomorrow morning if you didn't yet do that.
Your risk for HIV is very very small. You don't even know that the person has it or not. There no risk if they don't have it. Do you know this person? If so if they are willing to take the test they can rule that out. But, you can't force them.
The other risks Hepatitis B and C. You can get you blood drawn in about a month or so . Ask your work when they want you to do this. They sometimes get a baseline now to make sure you are negative to start with then another one in about a month or 6 weeks. Also, if you had been vaccinated with a Hepatitis B vaccine you would not get that.
What country do you live in?