The third, and most aggressive, form of skin cancer is malignant melanoma. Malignant melanoma often appears as an irregular, scallop-shaped, speckled mole. Fortunately, it is the least common and with early detection can be cured. Prompt treatment is very important because malignant melanoma can expand throughout the body and can be deadly.
It is important to become familiar with the "ABCD" warning signs of melanoma. Asymmetry - irregular shaped moles with unmatched halves; Border irregularity - notched or blurred edges; Changes in color - moles that have changed color to dark brown or black and have an uneven distribution of color including red, white or blue; and Diameter - watch for new growth in moles larger than 6mm or sudden increase in size.