Best treatment for wound scar removal? (photo)

Hi, I am 27 years old. 6//7 years back I got wounded in an accident due to which I had a big visible scar on my left cheek bone. Though it was not a major injury but the scar (uneven round shaped scar in the pic) has remained. As you can see in the pic I have a dark skin(brownish dark) and I am from India. I want to know if there is a good treatment that can atleast shrink the size of this scar, without any side effects like hyper pigmentation etc. The scar is around 1centimetre in diameter.

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