This could happen depending upon the placement of your wrists when you type...I have a pull out drawer type of U desk set up...My hands are below the writing table...This is the way I was taught in high school...It is the rested position...When your hands are up on the desk or table, it is an unnatural position for typing...This alone is the culprit in much of the CT problems...It is possible that this protrusion on your wrist came from this....If you are concerned about this, see your physician...I hope it gets better..Take care...
Caroline