"What treatment would be effective for the slightly indented area on my forehead caused by a scar?"

I have an old scar on my forehead, and there is a slightly indented part.

It's subtly visible when I apply makeup or when light shines on it, so it bothers me.

What treatment would be effective for these indented scars?

Stories about procedures like Juvelook, Subcision, and Fraxel

I've seen it a lot; I'm curious which method is good❓