Is it safe to whiten the labia using creams or laser treatments? If so, what treatment is best?

I am naturally tan and have a smooth skin in general, but the creases in my body is about 5 shades darker. (Inner thighs and butt, labia, elbow, knees, and there is like a thin necklace around my neck that is darker as well.) Do you know what my condition is and what is the MAIN cause of it? p.s. I am not fat so my thighs dont rub to each other, etc. I hope you can help me. Thanks.

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