Why am I always having recurrent painless small bumps on the cheeks which are like small pimples. They don't hurt just bring out fluid when pierced?

Mucocele . You are probably developing mucoceles. These are tiny salivary glands that are clogged up. They fill with fluid and pop like you described. Talk to your dentist the next time you are in the office if you have one present to verify. It's probably nothing but never a bad thing to have looked at to rule anything else out. Hope this helps!