what is a malignant melanoma
1 Melanoma is a disease in which malignant (cancer) cells form in melanocytes (cells that color the skin). 2  There are different types of cancer that start in the skin. 3  Melanoma can occur anywhere on the skin. 4  Unusual moles, exposure to sunlight, and health history can affect the risk of melanoma.here are two forms of skin cancer: melanoma and nonmelanoma. Melanoma is the rarest form of skin cancer. It is more likely to invade nearby tissues and spread to other parts of the body than other types of skin cancer. When melanoma starts in the skin, it is called cutaneous melanoma.
Malignant mesothelioma is a cancer that starts in cells in the linings of certain parts of the body, especially in the linings of the chest or abdomen. Cancer starts when cells start to grow out of control.Cells in nearly any part of the body can become cancer.alignant mesothelioma is a cancer that starts in cells in the linings of certain parts of the body, especially in the linings of the chest or abdomen. Cancer starts when cells start to grow out of control.