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Moles

Sometimes a mole is just a harmless growth. Other moles signal the presence of skin cancer. Which ones mean trouble?

Look for growths that are asymmetrical, have an irregular border, vary in color, have a diameter larger than 6 millimeters (one-quarter inch), or are changing or evolving. Melanoma, the deadliest form of skin cancer, may exhibit one or more of these features. People should tell their doctor if they notice any changes on their skin, advises the National Cancer Institute.

Next: Yellow eyes