RT Journal A1 Cardones AR, Grichnik JM T1 Α-melanocyte-stimulating hormone–induced eruptive nevi JF Archives of Dermatology JO Archives of Dermatology YR 2009 FD April 1 VO 145 IS 4 SP 441 OP 444 DO 10.1001/archdermatol.2008.623 UL http://dx.doi.org/10.1001/archdermatol.2008.623 AB Background  Synthetic peptides that target proopiomelanocortin receptors are being investigated as a novel and safe way to tan. It has been postulated that synthetic α-melanocyte-stimulating hormone (α-MSH) peptides may have protective effects against the development of melanoma because of their melanogenic activity. Their ultimate biological effect, however, especially in patients with dysplastic nevi or previous melanoma, has yet to be determined.Observations  A 40-year-old white man with a history of melanoma and multiple dysplastic nevi self-administered synthetic α-MSH. He developed crops of new pigmented nevi, many of which had atypical clinical and histopathologic features. The preexisting nevi became darker and acquired growth features. After α-MSH use was discontinued, the nevi progressively lightened and lost their growth features.Conclusions  Synthetic α-MSH peptides can drive proliferation of neoplastic melanocytic cells in predisposed patients. This could present an increased risk for melanoma development.