Black and Brown: Non neoplastic Pigmentation of the Oral Mucosa Head and Neck Pathology Springer Nature Link 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 Dark Spot on Lip: Harmless or Serious? What to Check First La Bouche Parfaite Melanotic macules of the tongue in a newborn Journal of the American Academy of Dermatology Labial melanotic macule (brown spot on lip) (Stony Brook Case 1) dermatology dermatopathology