What is the cause of recurrent melena stool with multiple telangiectasia and prominent veins in the proximal ascending colon in a 14 year old boy? 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 What is that coming out of exhaust? I'm so sorry to post a poop picbut this looks black and I'm wondering if I should be concerned. : r AskDocs Stool Colour Chart A quick clinical guide to interpret stool color changes and their possible causes. Stool appearance can give important clues about gastrointestinal healthbut always correlate with history, examination, and When is stool color concerning?