People with fair skin who easily sunburn, especially those with blonde or red hair, have less melanin in their skin cells and therefore may be at higher risk for the development of melanoma. This type of skin cancer is widely believed to be caused by exposure to the ultraviolet radiation of the sun. The Cancer Research Institute offers the following ABCDs of identifying melanoma:
A is for asymmetry. Melanoma lesions are irregular in shape instead of being symmetrical.
B is for border. Compared to moles that have smooth and even borders, melanoma lesions usually have irregular borders.
C is for color. In melanoma lessions, look for brown and black color in them in comparison to moles that are often one shade of brown.
D is for diameter. Melanoma lesions is about one-quarter inch or six millimeters across and routinely are about the size of a pencil eraser.
Source: http://www.all-antiaging-guide.com/skin-protection/identifying-the-signs-of-skin-cancer/
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