Hello
Your concern is valid, but when abscess is drain there is still some hard elevation is feel which resolve by the time.
Suppose a dentist drain your pus today then do cold copression with icepack from outer side of your cheek for 48 hours like 2 days 3-4 times.
After then do warm water with salt gargle 2-3 times a day. It will reduce gradually.
If there is abscess then must be a underline cause also, so go for complete treatment process.
Next Steps
your can do cold and hot compression to reduce hard swelling
Health Tips
do hot compression only after 48hours. and follow complete treatment guildlines.