Changes Induced by Drugs and Toxins Abdominal Key Hepatitis C Virus (HCV) Discovery HCV Quantitative Analysis of Melanosis Coli Colonic Mucosa Using Textural Patterns Frontiers CD8+ T Cell Exhaustion Phenotype in Chronic Hepatitis C Virus Infection Is Associated With Epitope Sequence Variation This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions Benign Discoloration Poses Questions