Use the ABCD rule to recognize symptoms of melanoma. Here are some examples of melanomas.

A. This shows asymmetry -- one half of the mole looks different than the other half. (top left image)
B. The border is irregular. (top right image)
C. The mole is more than one color. (bottom left image)
D. The diameter is greater than the size of a pencil eraser. (bottom right image)