ABCD refers to:
“A” is for asymmetry—the two sides of
the growth or mole do not match.
“B” is for border irregularity—the
border or outline of the growth is not smooth but shows indentations.
“C” is for color—the pigmented growth
contains areas of different colors such as blacks, browns, tans, grays, blues,
and reds.
“D” is for diameter—the growth is
larger than about 0.25 inches (6.35 millimeters) in diameter, or larger than a
pencil eraser.
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