Melanoma is the least common type of skin cancer. Still, it is the most deadly because it can spread if not caught early. 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. Excess sun is linked to melanoma risk. However, melanomas can also occur on skin not exposed to the sun (such as inside the mouth).

Skin Cancer and Pregnancy: What Every Woman Should Know

Here's a breakdown of what's normal, what's not.

How to Spot Skin Cancer

Beauty marks can certainly be beautiful. “But sometimes a mole can convert to something serious like melanoma,” says Rex Amonette, MD, vice president of the Skin Cancer Foundation.

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