“Melanosis” in the small and large intestine Melanosis oculi wih pigmentation of tarsal conjunctiva near lid margin. EyeRounds.org: Online Ophthalmic Atlas Hyperpigmentation Understanding Dark Patches on Skin ORAL MELANOTIC MACULE (OMM) (Also called focal melanosis labial melanotic macule) A benign, localized, flat pigmented lesion of the oral mucosa Caused by a focal increase in melanin production