Hello,
Without examination, confirmation of a diagnosis is tough, but it can be irritant contact dermatitis or Fordyce spots. 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.
Please consult a dermatologist for clinical examination as without clinical examination, it is difficult to make a diagnosis.
I hope it helps.