hello and welcome to HCM forum,
according to the history provided by you it states that you have a habit of biting cheek,
guided you well , by asking you to stop biting your cheek,
continuous biting causes repair of the tissue and as a response of the body, tissue becomes hypertrophic.
also, do not link this to oral cancer
, just try to avoid biting your cheek.
your dentist will prescribe you topical medicaments to apply, which will gradually reduce the white patch
maintain your oral hygiene
to prevent any infection in that area,
also oral antioxidants
i wish you good health,