It is very difficult to judge without seeing these bumps, and pain that has lasted for three months could be having many causes. Don't be alarmed but go to a dentist and get them checked.
Try warm water and salt gargles, 2 - 3 times/ day,
Next Steps
visit a dentist as soon as you can.
Health Tips
salt gargles are not advisable if you have hypertension/ suffer from high BP.