Ay, totoo yan momsh, maraming birthmarks and skin marks talaga ang lumalabas days or weeks after birth, hindi lang agad visible! Kaya kung ngayon lang nag-appear, very possible pa na mag-fade siya on her own, especially if it's light pa lang, pero honestly best to ask your pedia about it para sure kung anong type exactly and kung mag-improve pa ito over time, some do, some stay pero hindi na gaano halata as she grows. Wag mag-alala muna, common to na nangyari ito sa mga newborns!