Vitiligo?

So I've always had a spot on my stomach completely void of any pigment. It's a few cm long and about a cm wide. It's not a scar, the skin isn't damaged and it's completely flush against my skin. I've never injured myself there and it's been there forever.

I was washing my face today and noticed there's a patch of skin on my forehead, also about a cm big, that is a lot lighter than the rest of my skin and I'm wondering if it's possible for vitiligo to "spread/ develop" in my mid - 30s?

Reason why I think it's vitiligo is because two of my cousins actually have it and so did our grandmother.