Rexdrive Amino with L Arginine HCl, L Citrulline, Acetyl L Carnitine Arginate DiHydrochloride, and Glycine L Carnitine Explained: What This Amino Acid Does for Your Body Pigmented Lesions of the Oral Mucosa Pocket Dentistry Propionyl L carnitine . hydrochloride Bioss ORAL MELANOTIC MACULE (OMM) (Also called focal melanosis labial melanotic macule) A benign, localized, flat pigmented lesion of the oral mucosa Caused by a focal increase in melanin production