Moles are clusters of pigmented cells that are usually harmless when they remain stable and symmetrical. But if a mole begins to change in shape, color, or size—or worse, starts to itch, bleed, or crust—it could be a sign of melanoma or another form of skin cancer. Detecting these changes early is essential for effective treatment.
The ABCDE Rule for Identifying Suspicious Moles
Dermatologists use the ABCDE rule to help distinguish between normal moles and those that may need medical attention:
- Asymmetry: One half doesn’t match the other.
- Border: Edges are irregular, blurred, or ragged.
- Color: Multiple shades within one mole (brown, black, red, white, or blue).
- Diameter: Larger than 6 millimeters—about the size of a pencil eraser.
- Evolving: Changes in appearance over time.
If a mole meets any of these criteria, consult a doctor promptly.
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