Buy Melanotan 2 (MT2) 10mg Peptide COA Verified UK Oral Melanotic Macule MEDizzy MELANOTAN II 10 mg Peptide Cart Differential Diagnosis of Pigmented Lesions in the Oral Mucosa: A Clinical Based Overview and Narrative Review Brown spots, especially on the lips, can be alarming to some. In some instances it can indicate rare oral mucosal melanoma, however in this case it was a non cancerous labial melanotic macule.