A scar without a knife is just a scratch, just nothing. It's not something that can just..... disappear.

No. A scar is much worse than just a scratch. A scar hurts.

A scar leaves a mark for life.

A scar is a reminder of the pain you've endured. A reminder of the tough times you've gone through.

But, what's the knife? Could it have been a person?

Maybe.

It's not like it matters. The damage has been done already.