Other than any personal problems he may have.
Here is a thought.
Technically, color is determined by what we see reflected off of an object. For example, an orange is orange because it absorbs all other colors(light), but reflects orange back to our eyes. White is a combination of all colors being reflected off of an object. Black is the absence of color being reflected off of an object.
With this in mind if all of the races of the world continue to interracially breed the outcome is white people and no color.
Perhaps MJ has some fair skin in his gene pool ?