PREVENTION AND HEALTH: SKIN CANCER
What is it?
There are basically two important types of skin cancer. The non-malignant type is the more common and is seen in fair-skinned people who expose themselves excessively to sunlight. It is easily treated and does not kill. The malignant type is called a malignant melanoma and is a killer. Skin cancers are most common on the face and other areas where the skin is exposed to the sun. Any skin damage that does not heal properly should be seen by a doctor. Also, should a pigmented patch of skin you have had for years start to become more pigmented, be suspicious and seek advice. One type of skin cancer starts as a pale, pearly, raised, translucent nodule that slowly enlarges and then ulcerates. The next most common type is a small, raised area or patch that can be reddened or darkened and hard. A common site for this latter type is on the lower lip.
What causes it?
Researchers at the University of Arizona (a very sunny site) found that the incidence of the malignant form of skin cancer jumped 34 per cent over a ten-year period. Since 1960 until the present day the incidence of the non-malignant type has also risen by a startling 500 per cent. Nearly half of all the tumours were found in people aged between 50 and 69. Malignant melanoma is rising in incidence at a rate of 5 per cent per year in the US.
Other researchers have found that pale-skinned, easily burned people with an estimated lifetime sun exposure of more than 30,000 hours have a twenty times greater risk of developing skin cancer than a comparable group with less than 10,000 hours of sun exposure. More than 200,000 cases of skin cancer occur in the US annually though the incidence is much less in the UK because there is less sun. Northern climates have less sun and so less cancer of the skin. For every 265 miles you go closer to the equator the incidence of skin cancer doubles.
Another form of skin change caused by sunlight is the breakdown of the normal connective, elastic tissue called collagen. This produces premature ageing of the skin and is a reason why Californian women so envy the skin of English women.
Prevention
• Use a sunscreen preparation if you are in the sun a lot.
• Be guided by the general rules for preventing sunburn.
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