Hello, White patches on babies are not unusual. The cause can depend on a lot of things. When you look at the patch is it white because it is scaly or white because there is a loss of pigment? Most often, it s pityriasis alba, a fancy medical term for a white spot! Most likely on the cheeks, but I ve seen them everywhere. Also, friction can cause an area of whiteness in comparison to other skin. Sometimes it s a birthmark that has enlarged and become noticeable as the baby grows. But there are some more concerning white spots. Much less likely, but possible, is a depigmented white spot called an ash leaf spot because it is irregular, mostly oval and shaggy-edged. This can be indicative of a very very rare disease called Tuberous sclerosis. This can be related to seizures, so I m glad you re already scheduled to see a Neurologist. So while you re there, ask them to take a look at the white patch so they can tell you if it is just normal or not. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Lisa Baker