What is this air pocket/bubble inside my mouth on gums/cheek?

Need a photo: Without a photo or more accurate description that shows the area and size of the "air pocket" it is impossible to tell. See your dentist for an evaluation.

Possible Infection: Have a local dentist evaluate the lesion for treatment.

Needs to be seen: While it might look like the bubble is filled with "air", that really can't be. It may be filled with pus (an infection), mucous (mucocele), a neoplasm (growth) or something else. The only way to know for sure what it is & what to do about it, is to see a dentist. Even if it goes away, have it looked at, as many infections wax and wane and you don't want to take a chance of a real serious issue.

Bubble: Possibilities include, but are not limited to, fistula, cyst, mucocele, blocked major salivary duct, and so many other possibilities. Please see your General Dentist for an examination, differential diagnosis, and thus the appropriate treatment plan.

Needs Examination: It would be difficult to develop an air pocket unless pressurized air was introduced into the tissue. It may be an abscess. Please have it evaluated by your dentist.