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Melanoma, accounting for less than 5% of skin cancers, is one of the most dangerous of all cancers and is the most rapidly increasing form of cancer in the United States. The risk of melanoma is increased with occasional, intense exposure, such as blistering sunburns, especially in childhood, rather than long-term sun exposure. Australia has the world's highest incidence of melanoma, because of its location near the equator and population composed largely of people of Celtic extraction. The fact that melanoma occurs mainly on sites not overly sun-exposed indicates that other factors are involved. Major signs of malignant melanoma:- A mole with three or more shades of brown and black
- An existing mole getting bigger or developing an irregular outline
- A new mole growing quickly (months) in an adult.
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