Narrow band UVB refers to the specific wavelength of 311-312 nanometres (when we are outdoors our skin is exposed to the full spectrum of ultraviolet radiation whose wavelength is between 290 and 320 nanometres). Narrow band UVB has been used in dermatology for decades to treat inflammatory skin disorders such as psoriasis and eczema. In vitiligo, the treatment is effective not only because of the anti-inflammatory effect of the narrow band UVB, but also because of the melanocyte stimulating action which can assist re-pigmentation. Treatment is best undertaken 3 times weekly with up to 4-6 months required before a response is seen. The treatment can be delivered either within a whole-body cabinet or within a hand and foot cabinet. (pictures of UV machines).