My daughter who is 6,half of her finger nail has turned light brown the other half normal colour vertically?

Nail pigmentation: This is one of those rare cases where you can be told to go directly to the dermatologist. Most pigmented streaks for pigmented segmental parcel of meals are minor and are like small holes that originate at the proximal or close in and of a fingernail. But, these always need to be looked at by a dermatologist and then encourage you to do this right now.