Cure of your skin pigmentation disorder depends on the type of skin disorder you have developed. Skin pigmentation disorders include hypo-pigmentation, albinism, vitiligo, Hyper-pigmentation, Lichen Simplex Chronicus, Melasma, Birthmarks, Port-wine Stains.
You can differentiate your skin pigmentation disorder by visiting the following links:
en.wikipedia.org/wiki/Hypopigmentation
http://www.antivitiligo.com/vitiligo/albinism-and-vitiligo.html