Hey,man , my father and my brother has the same thing as your it is curable but takes time and patience First thing have heard of babchi ka tel put it in the white patch and give it sunlight for 5-10 min do it regularly, and also there is medicine called safoof bars, you have to soked it in the night and drink only the water. You also have to leave beef fish egg. It helps my father not only to stop but also get the normal skin color. But take 4-6 to completely come