How does sour cream get rid of hyper pigmentation on the face?

my friend had dark marks all over her cheeks and she used the sour cream method to get rid of it which i thought was so retarded but it worked about after a week or so it worked the marks were fading alot but i don't understand how it works can anyone explain to me how this works?How does sour cream get rid of hyper pigmentation on the face?
It's the lactic acid. Creams with so-called alpha-hydroxy acids, to which class lactic acid belongs, have a peeling effect on skin.








To Sherry below: MJ had a skin condition called vitiligo. He might have tweaked everything else but the skin whitening was not intentional. Of course then the blotchy skin was covered with plenty of make-up.How does sour cream get rid of hyper pigmentation on the face?
It works ONLY if you use a period between complete sentences. Run-on sentences in the form of questions will ensure your hyperpigmentations gets darker. See, the sour cream will notice how poorly you formulate thoughts into the written word. If you're unable to express yourself intelligently in writing, the sour cream will make your spots DARKER, and more permanent. It's using proper English, good grammar, and effective punctuation that makes one's complexion smooth and spot-free.
All I know is it worked for Michael Jackson. That is the method he used.