Melanotan II Wikipedia Brown spots, lentigos and freckles 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 longer lasting than Spot the Difference: Are Those Adorable Freckles or Unwanted Age Spots? Blog Face Forward Medical Aesthetics PDF) Changes of melanocytic lesions induced by Melanotan injections and sun bed use in a teenage patient with FAMMM syndrome