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Vitiligo resists treatment — understandably, as depigmented patches lack melanocytes, and any treatment must replace melanocytes before pigment can reappear. A recent report recounts the response in four adults with generalized vitiligo involving 15% to 30% of total body surface treated two or three times weekly for 1 month with narrowband ultraviolet B (NB-UVB). These exposures were proposed to stimulate undifferentiated melanoblasts and melanocyte stem cells in the protective niches of hair follicle bulge areas to express melanocortin receptors (MC1Rs). Starting in the second month, the investigators injected implants containing 16 mg of afamelanotide ([Nle4-D-Phe7]-α-MSH) into the subcutaneous fat above the suprailiac crest so that the a…