L.W.
My daughter every now and then gets white spots that had a bit of a rough texture to them (not sure if your dtr's has the same texture) on her face as well. My mom who was a nurse told me to put a bit of Selson Blue (the dandruff shampoo) on it. As crazy as it sounds, it worked. I would put a small dab on it before she went to bed and by the morning it looked better. No longer white nor rough. Like I said your dtr's may not be the same but it may be worth a try. I keep a bottle of it in the bathroom for such occasions. I have had to use it a couple of times. Good luck.