Melanoma () is a malignant tumor of melanocytes which are found predominantly in skin but also in the bowel and the eye (see uveal melanoma). It is one of the rarer types of skin cancer but causes the majority of skin cancer related deaths. Malignant melanoma is a serious type of skin cancer. It is due to uncontrolled growth of pigment cells, called melanocytes. According to a report by the WHO, about 48,000 people die of melanoma every year. Melanoma is prominent in New Zealand and Australia due to the hole in the ozone layer and the many beaches.