bump in mouth

Yesterday I had 2 bumps on the inside of my mouth.  I popped the one on the my inner lower lip and it is now a sore.  I also had a hard bump on the roof of my mouth that today is also a sore.  Any idea what this could be?

[Jerome Tsang, DDS]

If you can pop the bump, it could possibly be an abscess.  Sometimes with an infection from the tooth, it can spread through the jaw bone and exit out of the gums and create a swelling or bump which you can pop with pus coming out.  I would suggest you go see your dentist to check and find out whats going on.