Differential diagnosis of an oral mucosal pigmented lesion: a case of essential melanosis Pigmented (Purple or Brown) Lesions in the Mouth Pigmented (Purple or Brown) Lesions in the Mouth Kazemi Oral Surgery Facialart.com Melanotic Macules, Naevi, and Melanoma Springer Nature Link Diagnosis of oral pigmentations and malignant transformations ScienceDirect Pigmented Lesions of the Oral Cavity Oral and Maxillofacial Surgery Clinics