Vitiligo is a chronic disease and takes a lot of time to get alright. There are lot of myth and fancies associated with it. There are studies which show that vitamin c containing foods / fruits not make it more. It is also not affected by white foods. There is weak evidence that it may increase with use of turmeric. It may increase with processed or canned food. Liquorice may increase it. If your vitiligo is increasing then you have to be careful with the food you eat. Avoid citrus fruits also. As for medication availability in your city please visit a dermatologist for better consultation and treatment.