A condition marked by brown, blue, or gray patches, usually on the inside of the eye and on the skin near or around the eye. It may also affect the eyelid and mouth. It is caused by an increase in the number of cells called melanocytes in skin and eye tissue. Melanocytes make a substance called melanin, which gives color to skin and eyes. Having oculodermal melanocytosis may increase the risk of glaucoma and a type of eye cancer called intraocular melanoma. Also called nevus of Ota.