Using the ABCDE system can be a good way to check for changes to your skin. While performing this skin check, remember that if you notice anything unusual (including any of the following, or the development of a new spot), you should visit your doctor.

The ABCDE system reminds you to check five sorts of changes that include:

  • Asymmetry (unevenness) – one half of the spot doesn’t match the other.
  • Border – the edges of the spot are irregular, ragged, notched or blurred.
  • Colour – the colour of the spot is not the same all over and may include shades of brown or black, red, white or blue.
  • Diameter – the spot is larger than 6 mm across (about 1/4 inch) or is growing larger.
  • Evolution or elevation – the spot may change in shape or size (enlarge) and a flat spot may become raised in a matter of a few weeks.

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