Malignant melanoma is the most dangerous type of the skin cancers. Typical features of melanomas include irregular borders, multiple colors within the lesion, rapid growth, and susceptibility to easy injury with bleeding. Any mole that exhibits any of these changes should be evaluated immediately by your health care provider.
Review Date 2/27/2018
Updated by: David L. Swanson, MD, Vice Chair of Medical Dermatology, Associate Professor of Dermatology, Mayo Medical School, Scottsdale, AZ. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.