Small dark circle on inner cheek for a week,faded not a solid color, in between upper and lower teeth, no change for a week, kind of blanches?

Take: Take your dark circle, along with the rest of your face, to an Oral Surgeon for evaluation. You have put it off long enough.

Lesion?: These situations require a medical and dental history and most importantly a personal clinical evaluation. They cannot be diagnosed and treated over the internet, especially sight unseen. See your local dentist.