Fraxel Repair: Can the doctor treat just the scar on my tip or does he have to treat my entire nose?

I only have one scar on the tip of my nose that I want to treat, the doctor said it'd be cheap now he says it's $1200?He said that he would use the laser on the entire nose and that there would be no difference in price between doing laser on just the scar and doing laser on the entire nose. Does he really have to do the entire nose? I'm kind of uncomfortable with doing THE ENTIRE NOSE because I'm afraid of complications. I've read so many horror stories that id like to treat only in small areas not sections.