I don't believe Prince has vitiligo. I think fans are doctoring photos of Prince and adding blotch marks like Michael had on his skin to try and convince those who doubt Michael is the father Prince that he is Michael's biological son. I actually think fans who created these fake vitilogo photos should be ashamed of themselves, by creating a rumor about Prince who is an 11yr old boy and shouldn't be subject of speculation from is he Michael's biological son to vitiligo.
As I've said on other threads, I can't see why Prince, Paris and Blanket can't be Michael's biological children. Just because they don't look of obviously black origin, that doesn't mean they aren't half black. I'm mixed race/ bi-racial myself and very fair (though not like Michael's children, though they are the same complextion as me) with slim facial features and curly black hair. A lot of people can't tell what race I am, and often think my father must be mixed race/ bi-racial not black and certainly not a black man from Africa. I know mixed race/ bi-racial when I see them and I can tell Prince, Paris and Blanket are mixed race/ bi-racial. When you know how diverse the phentypes of mixed race/ bi-racial people are people wouldn't be so quick to dimiss that Michael is the biologiocal father of his 3 childrem, because it's not impossible.
Now if Michael had 3 half Japanese children and Debbie Rowe was said to be the mother, then it would be more than likely Michael wasn't the father and such speculation would be understandable. But unless Michael's 3 children ever have any questions if Michael is their biological father that's for them, not the media or fans to find out.