Take a close look at all moles because this is where melanoma begins. The following, known as the ABC's, are warning signs of potentially cancerous moles. Common moles are usually symmetric. Draw an imaginary line through the center of the mole. If one side is noticeably different from the other, the mole is asymmetric and may be a problem.
Common moles are usually one color.
Multiple hues or colors is a warning sign. A diameter greater than 6 mm is a warning sign Take notes on your findings and see your doctor. Dermatologists are generally the most skilled physicians in evaluating for skin cancer.