Melanosis coli** Melanosis coli is a benign, reversible condition characterized by brown black pigmentation of the colonic mucosa, most often due to chronic use of anthraquinone laxatives. The discoloration is caused Brasil A complete molecular biology assay for hepatitis C virus detection, quantification and genotyping A complete molecular biology assay for hepatitis C virus detection, quantification and genotyping Pigmentation (melanosis) of the colon Stock Image Science Source Images Benign Discoloration Poses Questions