I have a tiny bubbled, clear fluid filled bump inside my inner lip, it's painless. never had any bumps before. what could it be?

Likely a mucus: Cyst, which is harmless.If it lasts longer than a week, have your doctor or dentist have a quick look.

Mucocele: It sounds like what we call a mucocele with is a little sac filled with mucus as a result of a blocked minor salivary gland. They often resolve on their own or can be punctured by your dentist if they get larger or remain and annoy you. Occasionally they reform and have to be excised.

Probably a hydrocele: A hydrocele is a clogged serous gland, not draining fully and resulting in the clear fluid. A dental visit will verify what it is, but it may be gone when you go. So set up a visit, establish a diagnosis dialogue, then you can go when it recurs, which is likely

Mucocele possibly: The bump on the inside of your lip is probably a mucocele. It is caused when the duct to a minor salivary gland gets clogged or traumatized and the saliva backs up forming a fluid filled bump. They are most common on the lower lip but can occur elsewhere in the mouth as well. Small ones can resolve on their own. Large ones (as shown here) require surgical removal by and oral surgeon.