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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.

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 shows

Frequently asked questions

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 are asking

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

Sources & citations

  • American Academy of Dermatology, 'Skin Cancer' statistics (aad.org/media/stats-skin-cancer)
  • seer.cancer.gov ↗

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