Hi there. Thank you for your question. I will be helping you out with your queries
White bumps in the mouth have many causes.
HIV is one of the UNCOMMON causes of such bumps.
You mentioned that you already took PEP.
It is very unlikely for these bumps to be due to HIV.
I would appreciate it if you attach a picture of these bumps for me to see.
Please attach a picture of the bumps here for me to see, so that I can offer a better opinion.
If you are unable to attach a picture here due to some technical problem you can always upload the picture on www.tinypic.com and send the the link that would be present on the left hand side of the uploaded picture.