Dermatology A to Z
The ABCDE Rule for Moles
Almost everyone has moles. The vast majority of moles are perfectly harmless. A change in a mole’s appearance is a sign that you should see your doctor. Here’s the simple ABCD rule to help you remember the important signs of melanoma and other skin cancers:
A is for ASYMMETRY
One-half of a mole or birthmark does not match the other.
B is for BORDER:
The edges are irregular, ragged, notched,
C is for COLOR
The color is not the same all over, but may have differing shades of brown or black,
sometimes with patches of red, white, or blue.
D is for DIAMETER:
The area is larger than 6 millimeters (about 1/4 inch the size of a pencil eraser) or is growing larger.
E is for EVOLVING
Any mole that begins to change in any way should be evaluated by a dermatologist.