I have used this soap, which is the same as the soap we usually use, but it has whitening function, and then it can be used in particularly dark places. I didn't believe it at first, but I found it really useful after using it for a while, so I insist on using it every day now, hoping to get back to my 20-year-old skin. You really can. Go and have a look.

It didn't cost much. I bought it here.

tao.sh/mbjtnv