Yes. Also, when it’s starting to heal and you make it worse by tearing it up again.
When I was a kid, due to some sort of weird accident, one of my ears was badly sliced, and it took five stitches to fix it. Some jerk punched me in the ear and tore them a week later, and it made the scar MUCH worse.

Of course, after two decades it was mostly gone.

Oh! I know what you’re saying. You’re talking about when the skin doesn’t connect properly to make the scar tissue and glue. So moving around a lot (before the bandages go on) would tear apart the skin more, messing up the glue stuff, right?

No. They happen from the way the body makes a sort of connective-tissue-glue that doesn’t quite line up right. Some people scar more than others.
But tensing it up is gonna keep it from healing as fast because it’s still all shredded.