Hello,
These small bumps can be due to infected
hair follicles or Fordyce spots
on lips. They are small yellowish-white granules
on the inner surface and border of the lips.
Treatment of Fordyce spots includes CO2 laser or electro desiccation, TCA chemical peels(temporary treatment),diathermy or laser vaporization. You can discuss these treatment options with your dermatologist.
I hope it helps. Take care and regards.