a Multifocal brown macules on the hard palate showing variation in Download Scientific Diagram Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis A Black Spot on the Upper Gum for Many Years: Melanotic Macule Springer Nature Link Pigmented Lesions of the Oral Mucosa Springer Nature Link Metastatic oral malignant melanoma transformed from pre existing pigmented lesions in mandibular gingiva: Report of an unusual case ScienceDirect A Rare Case of Oral Mucosal Pigmentation: Differential Diagnosis and Case Presentation JCDA