Photomicrograph of an endoscopic colon biopsy (colonoscopy) showing melanosis coli, an accumulation of brown pigment (lipofuscin) within macrophages of the colonic mucosa, related to use of laxatives. Stock Photo Adobe Stock Shop our PT 141 Peptides Bremelanotide (PT 141) Nasal Spray Sweetwater Florida Peptides Pigmentation (melanosis) of the colon Stock Image C009 6107 Science Photo Library During colonoscopy, your gastroenterologist can tell if you abuse stimulant or herbal laxatives, especially those that contain senna. The condition is called melanosis coli or black colon. The frequent use of stimulant