I believe with his skin condition, and seeing black people alike suffering with it, to have half, part or all of your facial pigments in particular lost can have a devastating visual and psychological impact.
So much so, that I would go as far to suggest maybe his obsession with plastic surgery was maybe to hide the unusual appearance of his condition.
I don't necessarily mean the bleaching, that was most likely to removed the patches and give an all over white look.
Black people, and don't take this as a stab of mockery, often have more pronounced features. Ie, heavier bone structures, eyebrows, widers noses, more prominent lips etc. Now imagine the same on a white individual. It isn't common, and so it is more evident and striking.
I think jacko realised he was unusual to look at visually, and instead of staying what would have been an albino looking black guy, he took to the knife to make him more european/western to match his natural skin colour.
Being a music and performance star, it is all about how people view you - so to have the weight of a skin condition and such, you can only imagine how his confidence must have shattered coping with it, and thus his surgery obsession.
There is a famous example, a US tv anchorman called Lee Thompson with the same condition. He hasnt tried to hide it as MJ did.
Tragic life he has led.
Jenson drives it like he owns it; Lewis drives it like he stole it