Get in to see your Dr. These does not sound like cold sores because they're usually red. Are you in the sun a lot, did you eat something you normally don't? Be safe and have your Dr take a look at these. Remar
Could be a cold sore, they can be white. also, could be an allergy to something you may have eaten. I would see the dentist, he will be able to determine what it is.
could be herpies simplex. see your doctor or even your dentist.