I am a 21 yr old female in good health. I woke up this morning with what feels like a blister type pocket of fluid on the right side of the hard palate part of the roof of my mouth. It doesn't hurt, touching it causes almost the same sensation as when you burn your tongue with hot coffee. I need to know what could cause this, as well as how long it should last and whether I should leave it alone or try to drain it. Thank you.