| Normal Mole | Melanoma | Sign | Characteristic |
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Asymmetry | When half of the mole does not match the other half |
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Border | When the border (edges) of the mole are ragged or irregular |
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Color | When the color of the mole varies throughout |
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Diameter | If the mole's diameter is larger than a pencil's eraser |
| Photographs Used By Permission: National Cancer Institute |