My daughter (18 months) has an upper arm PWS, about 1 by 2 inches, which is noticeable when wearing a T shirt. Our first dermatologist initially said that this site doesn't normally respond very well to laser, then changed her mind in the middle of the consult, and said that "come to think of it they do respond reasonable well". We will be seeing another dermatologist in a weeks time for another opinion. Candela V beam pulse dye laser was the laser she recommended. Does anyone have experience with treatment in this area, and success rates, before we subject our daughter to treatment.