Its mostly due to tobacco smoking.
Quit the habit completely and do never restart.
The patch, if non scrapable, do not worry, it may not get eliminated. But won't cause harm.
Do not apply any gel or balm intraorally.
Have TOMATO as much as possible.
Maintain oral hygiene.
Next Steps
can go for lasers to eliminate the patch
only after a proper dental visit clinically.
Health Tips
as of now just quit any kind of alcohol consumption,tobacco smoking or chewing habits completely.