First of all welcome to the group.
I am a 23 year old with facial PWS. Unforuntly the Argon laser was widely used back in those days. I only had one treatment with one a few years ago knowing it was highly risky of scarring but the machine was still in expermental stages. Of course it scared my lip in the testing zaps that they did but I figured if it ever removes a birthmark someday it was worth me getting scared. The best part is after having debulking done on my lip the plastic surgeon removed the scar. ;D
Other then that one laser treatment I have been doing laser treatment with pulse dye lasers (candela) for the past 18 years. The V-Beam is the third one I have used and I think it is great. It is a lot faster and safer then all the older models.
I hope that the KTP treatment helps. I have not heard of it what does it stand for?
Does your PWS have any hypertrophia (puffy or thickness) on it? If so laser treatment is not the most effect way to get it removed. Debulking/ plastic surgery was my only option in my case. If you want to see picture you can visit my website www.hankspws.com
Dr. Waner did a great job. I only had three surgeries all of which where last year.
Again I hope your treatment works for you.
Talk to you soon.