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Skin Cancer Prevention

The ABCDEs of Checking a Mole (Save This)

A 30-second self-check can catch melanoma while it's still early and treatable.

A notebook and phone with abstract geometric notes beside a mirror, hat and magnifier-free accessories.
By the numbers

About 9,500 people are diagnosed with skin cancer in the U.S. every day (AAD).

The AAD reports about 1 in 5 Americans will develop skin cancer in their lifetime.
What the evidence actually says — NCI SEER — Melanoma of the Skin, Cancer Stat Facts

Questions we get a lot

What are the early warning signs of melanoma?

Watch for the ABCDEs: Asymmetry, irregular Borders, uneven Color, Diameter over about 6 mm, and Evolving (changing) spots. Also note any 'ugly duckling' mole that looks different from your others, or a sore that won't heal. See a dermatologist promptly about anything new or changing.

How often should I get a skin check?

Examine your own skin about monthly, and see a dermatologist for a professional check at least yearly — more often if you have many moles, fair skin, a history of sunburns or skin cancer, or a family history. Early detection makes melanoma highly treatable.

What does the ABCDE mole rule mean?

ABCDE is a checklist for spotting possible melanoma: Asymmetry, Border irregularity, Color variation, Diameter greater than about 6 mm (a pencil eraser), and Evolving size, shape or color. Any mole meeting these — or simply changing — warrants a dermatologist's evaluation.

What people keep asking

r/30PlusSkinCare: 'What does the ABCDE mole rule mean?'

Sources & citations

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