White patches may be tobacco pouch keratosis or leukoplakia. Antioxidants along with multivitamin supplements has to be taken. You can consult through this for prescription of medication and instructions on investigations.

Hello, The white patches as seen over the pictures are suggestive of traumatic keratosis (looking at the location of the patches, there might be history of repeated cheek bites) which is as of now not a serious concern but if left untreated might worsen the scenario. It will be best to visit your nearest Oral and Maxillofacial Surgeon or Dentist for proper clinical evaluation, diagnosis and treatment plan accordingly.

I would advice you to give a more proper history and get a thorough consultation done over a call or in clinic..