Melanoma is a serious form of skin cancer that starts in melanocytes, the skin cells that produce pigment. It is one of the most common cancers affecting people aged 25-29. Since 1980, there has been a 50% increase in melanoma cases among women aged 15-39. The document discusses the causes, risks, symptoms, detection, stages, treatment and prevention of melanoma. Early detection through skin exams and prompt surgical removal of suspicious moles or tumors can help detect and treat melanoma before it spreads to other parts of the body. Prevention includes using sunscreen and avoiding tanning beds.