White patch on inner cheek for 6 months. doc is not concerned only because when i see him its gone. it comes and goes every day or 2. any ideas?

White patch inside: could be a condition called leucoplakia - - sometimes associated with a precancerous lesion but can also be found in repeated trauma - biting the inside of your cheek for example. I would make sure your doctor sees it and evaluates it the next time it appears - a brush biopsy could be done. Another option would be for you to see an oral surgeon if your doctor won't help Good luck