Hello,
it's going to reside by itself. It's just keratinization of the buccal mucosa due to long term friction by the wisdom tooth. Since the cause (wisdom tooth) has been removed, the mucosa will heal soon. Nothing to worry. It's just keratinization and no cancer/tumor. Take care
Regards
Next Steps
You can do lukeworm water rinses 3-4 times in a day for 7-10 days. it's gonna heal little faster.