What is it? it's a bubble inside my mouth that has a spot of white with clear fluid surrounding it. it's on my upper cheek and i'm concerned

How long?: Are you certain that this hasn't always been in your mouth. It may be the duct to your parotid salivary gland in your cheek. It normally sits on the cheek next to the first molar. If so, it is normal anatomy, however I have had many patients "discovery" it. If it is new, is it possible that you recently bit your cheek? Sometimes sores in the mouth have a white coating on top.

Many possibilities: Any good Oral Pathology text book has pages full of answers that match your question. It's probably innocuous, but know that any white lesions in the mouth should be evaluated, so don't put this off. Call your Dentist or an Oral Surgeon for an examination, differential diagnosis, and (if required) treatment.

Suspicious bubble?: I would advise you to have the bubble inside your mouth examined by a dentist or dental specialist (e.g. oral surgeon, OFP). Any suspicious bubble that does not resolve itself in 2-3 weeks should be evaluated.