Why would you want to lighten your skin color. If the picture in your avatar is really you, then I think you look great just as you are. Besides, some skin color can look very exotic to men. Leave it like it is before you go wasting money on things that probably don't do a thing anyway.
I don't think you can, honestly.
The simplest technique you can do is use lemon dab some lemon juice on your face using a cotton piece twice a week. Do this for a month and you will see the difference and for the body try using ILUMA intense lightening body lotion with vectorize-technology, I have been using this for a couple of weeks now and I can see the difference.
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