Cancerous moles often follow something that are referred to as the ABCDE characteristics. A: Asymmetry, or uneven shape. B: Border irregularity, or ragged or notched edges. C: Color variation, such as multiple shades of brown, black, red, white, or blue. D: Diameter, in this case being larger than a pea. E: Evolving, like changes in size, shape, and color.