Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Melanoma is a form of skin cancers that originates in the cells that produce the skin pigment. Changes in the skin, such as rapidly growing, irregular, dark-colored marks, are the first symptoms of the disease. According to the World Health Organization, 132,000 melanoma skin cancers occur each year globally. Moreover, melanoma is the most dangerous form of skin cancers, causing most skin cancer related deaths. Learn more about the malignant tumor, its causes, symptoms and treatment in this book.