human
I've been hearing about a new type of cancer called melanoma. What is it?
assistant
Melanoma is a form of skin cancer that starts in the skin cells called melanocytes. It is most common in people who have fair skin, and is often caused by exposure to UV radiation from sunlight. It can also be caused by genetic factors or an immune system disorder. Melanoma is usually treated with surgery to remove the tumor and/or chemotherapy.