Diagnosing Cutaneous Melanocytic Tumors in the Molecular Era: Updates and Review of Literature 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 Ocular Melanosis 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 Changes in Oral Mucosa Associated with Melanotan II Injections: A Case Report