How can I get my white birthmark on my face corrected? (Photo)

I have a white birth mark on right side of my face and it appeared when i was 2 years old, now that i am 19 I really want to get rid of it. The doctors i have consulted before they said it's just a birth mark because of lack of melanin content in the skin cells. What treatment should i go u der to get this fixed?

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