Weight Paint Spikes

Whenever I make a character, it seems I don not
paint properly the parts. Hence when i move, say a hand
(in pose mode) 1-2 spikes will always remain.

There was a way, you went to edit mode
selected the stay vertex and did something to it,
and it went back to its original place,
How could this be done?
Thank you!

alt and r key to clear rotation …alt L for location…alter s for clear scale but you do this in object mode. In edit mode I do not know , only control z to undo. That’s all I know

Well i found it!
Although thanks for the answer!
You can assign the wanted area to a vertex group and in edit mode and give the same name to the group as the bone then you can configure the weight paint as much as you want.