GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often, Moles (melanocytic naevi, pigmented nevi) Melanocyte Melanin Stock Illustrations 316 Melanocyte Melanin Stock Illustrations, Vectors & Clipart Dreamstime A Dermoscopic Inspired System for Localization and Malignancy Classification of Melanocytic Lesions There are no 50 shades of melena, only one color: Black; and it's a color that smells bad. Otherwise it's not melena or it's derivatives (melenic, melanotic, melenatonic ) Great thread w a Melanoma Northwestern Medicine