I used to use Claravis Accutane 5-6 years because I had acne on my scalp. My question is how do I get my pigment back?

The reason I'm here today, because after using it, the doctor said ,my pigment on my scalp with come back. It been over 5 and my pigment is still the same. If you have any answers, please help me .My scalp look live I have vitiligo and my entire top part of my scalp has no pigment. I'm tired of living life under a hat. Thank you

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