These white bumps can either be naturally present or could be a pathology.
The naturally occurring white spots on inner surface of lips are called Fordyce's Spots which is normally seen in all healthy mouths.
However, in your case if they are causing any discomfort in the form of burning sensation or pain, then it may require further investigation.
Next Steps
Watch for any signs of redness or soreness associated with the spots. Rinse with warm saline solution thrice a day.
Health Tips
Have a balanced diet. Brush twice daily. Get a professional cleaning of teeth every six months. Never ignore flossing your teeth.