Pigmented oral lesion in a patient with metastatic melanoma Indian Journal of Dermatology, Venereology and Leprology Congenital Melanotic Macule of the Tongue: Report of Two Cases and Literature Review Head and Neck Pathology Springer Nature Link Cancer patient's tongue turned black and hairy 'after rare antibiotics reaction' The Independent What Caused These Multiple Hyperpigmented Macules of the Mouth? Pigmented Lesions of the Oral Cavity Pocket Dentistry