I still remember when Deepika made an entry in Bollywood. In her first debut film, Om Shanti Om, she looked beautiful in her dusky complexion, but now her skin shade has become much lighter.
And Deepika is not the only case, many other actresses like Kajol, Priyanka, Bipasha have changed completely because their skin tone has become lighter.
And I'm sure it's not just because of makeup alone. There is a wide range of chemical treatments that can reduce the melanin content and make the skin lighter and fairer.
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It is because of the chemical peeling which is a procedure that causes depigmentation of the skin and skin loses its color and becomes lighter.
Cryosurgery can be another reason, it is the type of surgery which destroys the melanin with the help of liquid nitrogen and allows the skin to generate a new layer with the lighter tone.
It is a chemical treatment which uses chemical elements that reduce melanin content and right light skin complexion is achieved.
It is one of the strange skin treatments that re-injects human blood to the patient's face that lightens the skin.
Disclaimer: This is not to promote any skin color. The natural skin is always the best we carry!