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Early Signs of Melanoma - ABCDEs, Self-Checks, and Next Steps

Spotting the early signs of melanoma can make a lifesaving difference.

This refreshed guide shows what early-stage melanoma can look like, how to check your skin at home, and where to find trustworthy resources—so you can act with confidence today.

Important Medical Disclaimer

This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you’re worried about any mole or spot, contact a qualified clinician promptly. You can locate a board-certified dermatologist via the American Academy of Dermatology (AAD) directory.

The ABCDEs of Melanoma: What to Look For

Dermatologists often use the “ABCDE rule” to evaluate moles and spots for early warning signs of melanoma. Keep these letters in mind during monthly self-exams and anytime you notice a new or changing spot. For visuals and more detail, see the AAD’s primer on the ABCDEs of melanoma.

A is for Asymmetry

Benign moles tend to be symmetrical—if you draw a line through the center, both halves should look similar.

What to look for: An asymmetric spot whose halves don’t match in size, shape, or height can be concerning. Picture an irregular inkblot rather than a smooth circle or oval.

B is for Border

Non-cancerous moles usually have smooth, even, clearly defined edges.

What to look for: Early melanomas often have borders that are scalloped, notched, jagged, or blurred, sometimes seeming to fade into the surrounding skin—more like a rugged coastline than the edge of a pond.

C is for Color

Benign moles are typically one uniform shade of brown.

What to look for: Multiple colors within a single spot—varying shades of brown, tan, or black, and sometimes red, white, or blue—are a red flag. A mole much darker than your others also merits prompt evaluation.

D is for Diameter or Dark

Size can be a clue, and so can how dark the spot appears relative to your other moles.

What to look for: Melanomas are often larger than 6 mm (about the size of a pencil eraser), but they can be smaller. Any mole that is growing, or one that looks markedly darker than your other spots (the “ugly duckling”), should be checked.

E is for Evolving

Change is one of the most important signs.

What to look for: A mole that changes over weeks or months in size, shape, color, or elevation—or begins to itch, bleed, or crust—warrants a professional exam. When in doubt, schedule an appointment.

Beyond ABCDE: The “Ugly Duckling” Sign

Most people’s moles share a common “look.” The Ugly Duckling sign refers to any mole that stands out from your usual pattern. It might be the only very dark spot in a cluster of light moles, the largest in an area of small moles, or a hairless spot when others have hair. If a mole catches your eye because it looks different, trust your instincts and get it checked. Learn more about this concept from DermNet.

Where Melanoma Appears—and How to Check

Melanoma can develop anywhere on the body, even in areas with little or no sun exposure. A monthly head-to-toe self-exam helps you learn your skin’s baseline so you can notice changes early. For step-by-step visuals, use the AAD’s illustrated guide to performing a skin self-exam.

Common and hidden areas

  • Common areas: In men, the chest and back are frequent sites; in women, the legs are common locations.
  • Hidden areas: Check your scalp (use a hair dryer and mirror), the soles of your feet, between toes and fingers, under and around nails, and your back (use a hand mirror or a partner).
  • Acral lentiginous melanoma (ALM): This type can appear as a dark streak under a fingernail or toenail, or as a spot on the palms or soles, and is more common in people with darker skin tones. Read more from DermNet.

Quick Self-Check Routine (5 Minutes)

  • In bright light, examine your face, ears, scalp, and neck; part hair with a comb or use a hair dryer.
  • Check hands, between fingers, arms, and underarms.
  • Focus on chest, abdomen, and sides; women should also check under breasts.
  • Use a hand mirror for back, buttocks, and backs of legs.
  • Sit to inspect genitals, fronts of legs, feet, soles, and between toes; don’t forget toenails.

Why Early Detection Matters

When melanoma is caught early (localized), outcomes are excellent. The 5-year relative survival rate for localized melanoma exceeds 99%, according to the American Cancer Society. That’s why monthly self-exams and routine professional skin checks are so important.

Frequently Asked Questions

What are the main risk factors for melanoma?

Key risks include unprotected or excessive ultraviolet (UV) exposure from the sun or indoor tanning; fair or freckled skin that burns easily; a history of blistering sunburns (especially in childhood); a personal or family history of melanoma; and having many or atypical moles. Explore the Skin Cancer Foundation’s risk factors for a deeper dive.

Can a non-cancerous mole turn into melanoma?

Yes. While many melanomas arise as new spots, an estimated 20–30% develop from existing moles. This makes the “E for Evolving” rule critical—any change in a long-standing mole should be evaluated. Learn more about melanoma risks and causes from the National Cancer Institute.

Is melanoma always dark brown or black?

No. A less common type, amelanotic melanoma, lacks pigment and can appear pink, red, or skin-colored. Because it’s less obviously dark, its evolving nature—growth, new symptoms like itching or bleeding, or other changes—becomes an especially important warning sign. See DermNet’s overview of amelanotic melanoma.

What to Do If You Notice a Suspicious Spot

  • Don’t wait: If a spot meets any ABCDE or Ugly Duckling criteria, make an appointment with a dermatologist promptly. You can search the AAD’s Find a Dermatologist tool by ZIP code.
  • Document: Take clear, well-lit photos with a date stamp to track changes over time.
  • Protect: Practice sun safety—seek shade, wear protective clothing, and use broad-spectrum SPF 30+ sunscreen, reapplying every two hours and after swimming or sweating. Review the CDC’s sun safety guidance.

Knowing the early signs of melanoma—and checking your skin regularly—empowers you to act early. If something looks or feels off, trust your instincts and see a professional without delay.