6. Discoloration of Skin or Moles
Skin changes are a dangerous sign. Any freckle, mole, or wart that changes color, size, shape, or that loses its sharp border should be seen by a doctor right away.
Any skin color change should also be told to your doctor right away. There are two possible cancer risks that you need to look out for. Skin cancer and the much more serious and dangerous, melanoma.