ive got these little bumps in the corner of my mouth. The next day the were gone but had turned more into chapped lips. A couple days later the other side did the same thing. I get coldsores and these are somewhat similar but dont keep growing or as painful. There is a. Mild tingling that feels more like chapping.
First no need to worry. Since these bumps go within a day it may be due to any minor infections. And if it remains for few days it may be some kind of infection commonly this is herpes infection. It can b due to coming in contact with the surface which have that virus. It starts as tiny bumps then slightly grow in size over a period of 2-3 days. Its irritating and lips also become chapped. Now as in your case look out for these bumps for next 1-2 days, if you find them there then I will suggest you to use acyclovir cream "common brand herpes" on the affected part thrice daily for 4-5 days. Hope that you will get received.  If symptoms persist for longer then u must visit a dentist.