Vitiligo is a skin pigmentation disorder that can be very distressing for those suffering from it. Narrow-band ultraviolet B (NB-UVB) is a type of phototherapy, and is considered one of the safest and most effective therapies for vitiligo. ‘Narrow band’ refers to a specific set of wavelengths of UV light, 308 to 312 nm. It has been proven to be the most beneficial component of natural sunlight for treating skin disease. It is safe when performed by a licensed Dermatologist who will carefully modulate your exposure to UV-B light to make sure it improves pigmentation in the affected areas, without harming your skin.