Definition of melanocytic macules associated with Peutz Jeghers syndrome NCI Dictionary of Genetics Terms NCI Labial melanotic macule (brown spot on lip) (Stony Brook Case 1) dermatology dermatopathology Labial melanotic macule 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 Pigmented Lesions of the Oral Mucosa Pocket Dentistry Pigmented Lesions Springer Nature Link