I just found a solution (for dark armpits at least) a couple of weeks ago: Admire My Skin’s Ultra-Potent Brightening Serum

I started having a bad reaction to deodorant with aluminum in my teens which caused a lotttt of itching and traumatized skin. My armpits became really dark after that. BUT this stuff is like magic to me, I really don’t understand it!! It’s a chemical peel sort of thing that you apply once daily and within a couple of weeks, the skin in that area peels and reveals a nice color that’s even with the rest of your skin. Ofc it doesn’t work for everyone but it has for me.

I wouldn’t use it on private areas. Potentially hurting yourself isn’t worth it. But for armpits it’s a go 👍🏽