A mole with uneven, jagged, or scalloped edges can be a warning sign of melanoma, a type of skin cancer. Normal moles typically have smooth, regular borders, while irregular or asymmetrical edges may indicate abnormal cell growth. Changes in shape, color, or size over time, or a mole that looks different from your other moles (the “ugly duckling” sign), are important cues to watch for. It’s advisable to seek prompt evaluation by a dermatologist if you notice any of these features, as early detection of melanoma significantly improves treatment outcomes.