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 Diffuse cutaneous melanosis: rare complication of metastatic melanoma * ScienceOpen Melanotic schwannoma mimicking metastatic pigmented melanoma: a pitfall in cytological diagnosis Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports