if you mean you have an infection on the upper palate of your mouth I would advise you to not mess with it. see a dentist, he will take care of it and give you antibiotics.
the problem with infections like this in the mouth is they are close to the brain and there is a rich blood supply in and around the mouth. this makes the possibility of infection spreading to the brain or getting into the blood and attacking your heart; very scary. do not do anything until you see a doctor or dentist.
dont crush it