My daughter has had a wheatish birth mark on her neck since we noticed. We visited many dermatologists and they all said it is birthmark and nothing else. No medication needed. Last week, she had one very small wheatish patch (not completely white) on her cheeks and the doctor said it is Pityriasis Alba. He has given Tacrolimus 0.03% and surprisingly for neck birthmark, he has given Vitibex lotion(which is for Vitiligo). Is it ok to apply it for birthmark? Also will this Pityriasis Alba go away with medicine? How much it will take? I am very concerned looking at both depigmention marks on my daughter