So curious about this, how does women do it?

I met my college friend after 4 yrs, she and I used to be batchmates back in Uni. We were very close during our UNiI days and we drifted apart post Bachelor's.

So coming to the point, She used to have a light dark skin and yesterday when I met her she looked completely different like she no longer have dark skin. Good for her, she used to be very under confident.

When I saw her yesterday, it's like she's completely different lost some weight(she got even more skinnier) , her skin has become so flawless and she no longer have that chocolate skin. She wore this black top paired with blue jeans and blue jhumka, wow absolutely gorgeous.

Now my question is How to change skin colour at all? Is it possible to change the skin tone from chocolate to Indian white ? I couldn't able to ask her as it would be completely inappropriate.