Vitiligo is an autoimmune condition. If it has been stable for mare than six months - that is if it has not grown and if you have not seen new patches, and if it has not responded to creams then you could go in for any of the vitiligo surgeries - melanocyte cell suspension surgery or even suction blister grafting if its a small patch. With this the colour would return.
Next Steps
see a qualified dermatosurgeon near you
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