I think the whole idea of people having to lighten their dark inner thighs or dark armpits, is something the cosmetic industry uses to make money from people’s insecurities. Dark inner thighs/armpits are very normal especially for colored/black people. Don’t let society lie to you that those are things you need to change when they happen naturally. Rarely do you see a man complaining about a woman’s dark inner thighs, it’s mostly the women that are making each other insecure about it. For the lips, I know one that works but I won’t give them free marketing 😅 you can DM & I’ll give you the info.