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 Melanotic schwannoma mimicking metastatic pigmented melanoma: a pitfall in cytological diagnosis Metastatic Melanoma: Symptoms, Stages, Treatment Diffuse Melanosis Cutis Under Immuno and Targeted Therapy Cussigh 2025 JEADV Clinical Practice Wiley Online Library Malignant melanotic nerve sheath tumor with PRKAR1A, KMT2C and GNAQ mutations Eruptive melanocytic nevi heralding the diagnosis of metastatic malignant melanoma: A case report ScienceDirect