A mole may be suspicious if it exhibits the following signs: - Asymmetry: One half does not match the other. - Border: Edges are irregular, notched, or blurred. - Color: Uneven shades of black, brown, tan, or even white, red, or blue. - Diameter: Larger than the size of a pencil eraser (6mm). - Evolving: Changes in size, shape, color, or begins to itch or bleed.