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Abstract

A method of promoting healing of wounds or tissue damage comprises irradiating the affected area with polychromatic radiation substantially within the wavelength range of 405 to 904 nm. Preferably, the radiation has substantial intensity at a wavelength of one or more of 633, 680 or 780 nm, so as to stimulate DNA/RNA synthesis. Preferably, the radiation has substantial intensity at a wavelength of 750 nm so A as to promote protein synthesis. Preferably, the radiation has substantial intensity at 890 nm, so as to cause increased cell proliferation. Preferably, the radiation has substantial intensity at a wavelength of 880 nm, so as to inhibit fibroblast proliferation. Alternatively, the radiation has substantial intensity at 820 nm and/or 870 nm, so as to enhance the release of stimulating factors. A method of treating hypopigmentary skin disorders, such as vitiligo, comprises irradiating a hypopigmented area of a patient's skin with low intensity ultraviolet radiation. Preferably, the low intensity ultraviolet radiation has substantial intensity at a wavelength of at least one of 365, 404 and 434 mn. Preferably, the radiation has a substantial intensity at a wavelength of approximately 760 nm. The radiation may be provided by an array of discrete light-emitting diodes arranged to emit the polychromatic light or low intensity ultraviolet light.

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