Melanoma often develops in a pre-existing mole that begins to change or a new mole. It is estimated that 20% to 40% of melanomas arise from an atypical mole. This is why it is so important to be familiar with the moles on your body and perform regular self-examinations of your skin. When looking at moles, keep in mind the ABCDEs of Melanoma Detection:

• Asymmetry . If you could fold the lesion in two, the two halves would not match.
• Border . Melanomas often have uneven or blurred borders.
• Color . Melanoma typically is not one solid color; rather it contains mixed shades of tan, brown, and black.  It can also show traces of red, blue or white.
• Diameter . While melanomas are usually greater than 6 millimeters (about the size of a pencil eraser) when diagnosed, they can be smaller. If you notice a mole different from others, or which changes, itches, or bleeds even if it is smaller than 6 millimeters, you should see a dermatologist.
• Evolving . A mole or skin lesion that looks different from the rest or is changing in size, shape or color.

May 2009
Sources: http://www.skincarephysicians.com/skincancernet/melanoma.html

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