What is metastatic melanoma?

Melanoma is a type of skin cancer that develops from the pigment-producing cells (melanocytes) of the skin, mucosa, eye, and rarely other sites. Metastatic melanoma is melanoma that has spread to other sites of the body. The spread occurs through the lymphatic system and/or the blood vessels. Melanoma can spread to the subcutaneous tissue which lies underneath the skin, the lymph nodes, and to other organs such as the lungs, liver, bone or brain.

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Source: dermnetnz.org