Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Benign oral mucosal lesions: Clinical and pathological findings Journal of the American Academy of Dermatology Pigmented Lesions Pocket Dentistry Labial melanotic macule A 71 year old man presented with a 2 year history of a darkening line on his left thumbnail. Also noted were a brown discoloration of the left thumbnail and hyperpigmentation of the proximal nail Ophthalmic Herpes Virus Infection and Hutchinson Sign