A broad title to indicate the uncontrolled growth of abnormal skin cells. If untreated, the cancer cells then spread to other tissues of the body. Different types of skin cancer include basal cell carcinoma, squamous cell carcinoma and melanoma (which although less common is more dangerous and the leading cause of mortality for skin cancer patients). Various factors are involved in the incidence of skin cancer such as genetic predisposition, age, lighter complexion and the widely publicized damage by UV sun exposure. Symptoms vary greatly but features to look out for include the asymmetry, borders, colour and diameter of the abnormal area or mole. Surgical intervention is common if caught early but prognosis varies across different cases.