What's the difference between myokymia and fasciculation? hope doesn't matter for layperson; so long as he says muscle quivers the doctor understands.

Numbers: Both myokymia and fasciculation refer to involuntary muscle fiber contractions seen in a person but which are not sufficient to move a limb or joint. The difference is in the numbers. The former involves a few muscles moving in a visible wormlike progression while the latter involves a few fibers seen as quick twitching of the skin in a very small area. Both can be seen in benign conditions.