Great question, let me help you.
What you have is likely a canker sore. Canker sores commonly occur in these areas high above teeth on the fleshy gum tissue.
These occur randomly, and are most commonly a result of stress of some sort
Sometimes it can also be cause by trauma from scraping the area with a toothbrush or fingernail, etc
Canker sores commonly have the same pain you are experiencing. They don't hurt when biting down, but can hurt when moving your facial muscles or jaw
They can big large or small, but even the small ones can be quite noticable
The treatment for canker sores is to wait 7-10 days for them to heal on their own
You can get your dentist to prescribe Kenalog steroid gel to put on it
this helps it heal quicker
but this is not necessary b/c it will heal on it's own
It will slowly get better and less painful, so you should not expect anything to get worse over the next 3/4 days
You will be fine to wait until you see your dentist
but honestly, you don't need to see him for something like this unless it continues to hurt, then he can prescribe the kenalog
No pus pockets will develop, the pain should not get worse, no abcess will develop, and this is not an emergency situation
Thank you in advance for clicking accept
Dear Dr. Alex.
Thank you for your thorough answer and explanation. I appreciate it.