Malignant Melanoma is by far the most dangerous. Melanomas often start as small, mole-like growths that increase in size and change in color. The American Cancer Society offers a simple ABCD rule to outline the warning signals of melanoma. A is for asymmetry . One half of the mole does not match the other half.
B is for border irregularity .
The edges are ragged, notched, or blurred. C is for color . The pigmentation is not uniform, with variable degrees of tan, brown, or black. Any sudden or progressive increase in size should be of particular concern. Malignant Melanoma is often fatal and spreads easily.