What are Black Celebrities using to De-pigment their skin? (photos)

Rihanna, Nicki minaj ,lil kim and others have gotten drastically lighter over the years.. What is the treatment or Process they're using to lighten their skin so drastically. Please don't respond with " love your skin" or " the process might be harmful" I want straight answers please. I know they got through dermatologist so I don't want any answers that contain "natural" remedies , i just want to know what they're using to achieve their skin color.

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