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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This Influencer’s Birthmark Turned Out to Be Melanoma: 'I Could Feel It Growing'

Jenna Colgrove, 33, noticed the birthmark near her ankle looked strange. Weeks later, she was diagnosed with melanoma, the deadliest form of skin cancer.
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More on Melanoma

Is It a Mole...or Skin Cancer?

Find out the differences between regular moles and ones that could be potentially cancerous.
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I Was Diagnosed With Melanoma at 27 After Years of Tanning

Lauren Beloff, 36, was diagnosed with melanoma at age 27 after more than two years of tanning nearly every other day. She was diagnosed with skin cancer again at age 31. Here’s why she now says she “learned her lesson” about sun safety.