Skin Cancer Home > The ABCDE Signs of Skin Cancer: "B" Is for Border Irregularity
Most moles are noncancerous and appear with uniform, smooth edges. However, a mole that has uneven, ragged, or "blurred" edges could be a sign of skin cancer. By checking your skin on a monthly basis, learning how many moles you have, where they are, and what they look like, you can help detect -- and even prevent -- skin cancer.
Skin Cancer vs. Normal MoleIf you notice a dark spot or mole on your skin, it doesn't automatically mean it is skin cancer. However, knowing how to tell the difference between a "good" mole and a potentially cancerous mole is important to prevent serious skin problems.
- A for asymmetry -- one half of a mole does not match the other
- B for border irregularity -- the edges are irregular, notched, or blurred
- C for color -- the color is not the same all over and may include shades of brown or black, or sometimes with patches of pink, red, white, or blue
- D for diameter -- the spot is larger than 6 millimeters across (about ¼ inch -- the size of a pencil eraser), although melanomas can sometimes be smaller than this
- E for evolving -- the mole is changing in size, shape, or color.