Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and Pyoderma Gangrenosum Secondary to Melanotan Cureus Melanotan What It Is and Its Relation to Skin Cancer White model who now "identifies as black" after having tanning injections, announces plan to widen her nose and "move to Africa"