Sudden bump on my wrist not painful unless really push not red appears when wrist is planter flex gone when wrist is regular, what could it be

It's in the wrist!: My first thoughts are ganglion cyst vs. Synovial cyst. Space here doesn't allow elaboration but i would let your doc take a look. He or she should be able to tell pretty quick.

Dorsal ganglion: If on the top side of your wrist, likely a ganglion. These are benign and not dangerous. No need for treatment unless becomes painful on a regular basis.