The major problem with vitiligo is the psychological impact if the person thinks he or she is disfigured. Obviously, this can be more of a problem for darker-skinned people. Also, the unpigmented skin is very susceptible to sunburn and skin cancer. Spontaneous repigmentation is rare. There really are not any very good treatments.
Cosmetics are effective in concealing the unpigmented patches.
Sunscreens and coverings should be used to protect against sun exposure. It's important to know that there is a fungal infection called tinea versicolor that may mimic the appearance of vitiligo. Scraping of a tinea lesion will yield fungus that can be seen under the microscope. A biopsy will show that vitiligo has destroyed all the melanocytes, as compared to tinea, where many remain alive. This may be worth checking.