Hello i need help

I have on palate bladder inside this bladder is water ,maybe inside is saliva 

This is done easily when I eat sour and chews gum

After bursts and he comes again ,This bladder does not hurt

I tried to zoom in on your pics but was blurry. What am I looking for? What do you mean by pallet bladder? Is it painful?? It bursts when you eat sour what? It keeps refilling, you think it's saliva. How does it taste?? Do you spit it out to see the color or smell? Your doctor can tell you if it's a infection.

How to press on the picture is growing. increaseth like I eat acidic things lemon and such different sauces. doctor told me it's a Mucocele