A is for ASYMMETRY: One half of a mole or birthmark does not match the other.
B is for BORDER: The edges are irregular, ragged, notched or blurred.
C is for COLOR: The color is not the same all over and may include shades of brown or black, sometimes with patches of red, white or blue.
D is for DIAMETER: The spot is larger than 6 millimeters across (about ¼ inch – the size of a pencil eraser) or is growing larger.
Mole images courtesy of the National Cancer Institute.
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