This is my first post here but I wanted to share that I have a pws on about 50-60% of my right leg (also changes color from pale pink to deep purple depending on lighting/temperature) I've had two laser sessions so far. the first one did nothing at all, but cleared up quickly. I think it as an IPL laser. the second laser was the v-beam and I still have marks from that and it was done 3 months ago. Word of advice - do this during the colder months so that you can cover it up. You can't go in the sun for months or you may get permanent stains.
So far, little improvements. Some fading, but I still have brown spots where the laser was done.
Hope this helps a little.