Hello I am wondering what is the best and safest way to lighten the vagina area?

 after having several laser treatments it has gotten darker and I do not like the appearance because it use to not be a problem. I was thinking of doing a tca pee but dont know the % i should buy. i am a white female in her twenties. l I have used creams like epibright literally a waste of money. please let me know thanks!

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