Metastatic melanoma Stock Image C056 0518 Science Photo Library Diffuse cutaneous melanosis: rare complication of metastatic melanoma * ScienceOpen Pathology Outlines Metastatic melanoma Amelanotic Malignant Melanoma: A Case Report Cureus 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 An 84 year old man with a history of metastatic melanoma of the scalp who was undergoing immunotherapy presented with new, multiple blue gray macules on the scalp.