Nevus of Ota is a benign dermal melanocytic condition characterized by bluish grey or slate brown pigmentation involving the skin around the eye and ocular tissues. It occurs due to an increased number of Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Black and Brown: Non neoplastic Pigmentation of the Oral Mucosa Head and Neck Pathology Springer Nature Link Pigmented Conjunctival Cancers (Primary Acquired Melanosis) New York Eye Cancer Center