It is unlikely a lesion would have been noticed at the "nothing" stage,
so it is difficult to answer this question.
    Leukoplakia is a clinical finding, but as such leukoplakia or
erythroplakia implies there is a suspicion of cellular atypia.  In
practice, we can't tell this by looking--the lesion needs to be biopsied.
    Most of these lesions turn out to be hyperkeratosis--analagous to a
callus on the skin.
    If this is a pea-sized or smaller lesion, just get it removed.  That
will give you useful information--googling will not!

Steve

a pea in just 3 days, on the mouth cheek? <<

Well, let's just say that if it's cancer growing at that rate, you have
just about a week before it eats your head.

SBH