Skin Path Histology Slides Pigmented Flashcards Quizlet Diffuse pigmentation of the oral mucosa Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics Oral melanoacanthoma of the palate: An unusual presentation of an uncommon entity JAAD Case Reports 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