Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian 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 IMB issues warning over tanning injections at salons or bought on internet The Irish Times Changes in Oral Mucosa Associated with Melanotan II Injections: A Case Report