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Nevus of Ota is a hyperpigmentation [3] that occurs on the face, most often appearing on the white of the eye. It also occurs on the forehead, nose, cheek, periorbital region, and temple. [4] It was first reported by Masao Ōta of Japan in 1939. [5]
Ocular melanosis (OM) is a blue-gray and/or brown lesion of the conjunctiva that can be separated into benign conjunctival epithelial melanosis (BCEM) and primary acquired melanosis (PAM), of which the latter is considered a risk factor for uveal melanoma. [1]
Nevus (pl.: nevi) is a nonspecific medical term for a visible, circumscribed, chronic lesion of the skin or mucosa. [1] The term originates from nævus , which is Latin for " birthmark "; however, a nevus can be either congenital (present at birth) or acquired.
Oculodermal melanocytosis (nevus of Ota) [3] Pigment dispersion syndrome – a condition characterized by loss of pigmentation from the posterior iris surface which is disseminated intraocularly and deposited on various intraocular structures, including the anterior surface of the iris. [medical citation needed]
Phakomatosis pigmentovascularis is a rare neurocutanous condition where there is coexistence of a capillary malformation (port-wine stain) with various melanocytic lesions, including dermal melanocytosis (Mongolian spots), nevus spilus, and nevus of Ota.
Hori's nevus, also known as acquired bilateral nevus of Ota-like macules, is a cutaneous condition characterized by multiple brown–gray to brown–blue macules, primarily in the malar region of the face.
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In 1937, he returned to Tokyo Imperial University. His interest in leprosy increased and he performed experimental works intended for the inoculation of leprosy which failed. In 1938 he first presented the case which was later named Nevus of Ota in 1939. [3] The Nevus of Ota is a birthmark, mostly seen in Mongoloid people.