I have a red line on my top gum with white blotches and pain on the side of the palate. i took antibiotics and the pain went away. the pain returned, so i had to take more tablets.what is going on?

Infection: This sounds like an infection. If you are taking the antibiotic as prescribed by your dentist or doctor and it is not getting better, you should go back for a reevaluation. You may need to change the antibiotic or have a more definitive treatment.

Possible trush: If the white area can be removed like a film leaving redness underneath, would confirm this. If you wear dentures this even more likely. Anti-fungal meds more effective than antibiotics for oral candidiasis.

Needs to be seen: These types of situations should not and cannot be diagnosed over the internet. It requires at least an actual visual one on one personal clinical examination. Please see your dentist as soon as possible to determine what in fact is wrong and what treatment is indicated.