Melanoma is the least common but the most deadly type of skin cancer. Melanoma symptoms include a change in the shape, size, or color of a mole, but melanomas can also look like a bruise that doesn't heal or a dark streak under a finger or toenail.
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All Five Stages of Melanoma—Explained by a Dermatologist
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Is It a Mole...or Skin Cancer?
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What Does Melanoma Look Like? 5 Skin Cancer Signs to Watch For