Is this Vitiligo or something else?

I'm a black teenager, but when I was born my skin color was completely white. Over time, my skin darkened from when I was like two years old, but there are patches on my skin from the white skin that was there. I appear to be someone who's afflicted with Vitiligo, but I'm unsure on if it is it or not, because it's more of something that I was born with, instead of something that just happened at some point in my life.