1) After tooth extraction, sometimes a small sharp piece of bone slowly pushes through the gum as the body remodels the area.
This can feel like a white bump, hard to touch, and may irritate your tongue or cheek during chewing.
2) Scar Tissue Lump
Sometimes a firm white scar nodule forms where the gum healed.
Not painful but can be irritating when chewed on.
Next Steps
To give you an accurate opinion, I would need to see the affected area. Since this is a public forum, I recommend starting a private consultation where you can securely share a photo. That will help me guide you better.
Health Tips
Run your tongue or clean finger over it: is it sharp, smooth, or soft?