My daughter has extensive PWS all over her body. For the most part, it is very light pink, but does change colors based upon her body temperature and the weather outside.
In the past 4 treatments, her doctor has started treating the light pink spots on her legs and I have noticed a difference. I see lighter areas where the laser has worked. She also has her ankles and fee treated, but since it is more an "extra" at the end of her treatment session, the doctor has not concentrated on the area. We are still working on getting her upper lip and cheek broken up more than anything else at this point.
I can check to see if I have any good comparison pictures for you.