Is My Mole Cancerous? A Dermatologist-Based Checklist

Dermatologists evaluate moles using two complementary systems. The ABCDE rule looks at: (A) Asymmetry — one half does not mirror the other; (B) Border — edges are ragged, blurred, or irregular; (C) Color — multiple shades of brown, black, red, white, or blue within the same mole; (D) Diameter — larger than 6mm (pencil eraser); (E) Evolution — any change in size, shape, color, or symptoms.

The additional two points are: (F) Firm to touch and growing; (G) Growing progressively over weeks. If your mole scores on any of these criteria, a professional evaluation is recommended.

Normal moles are typically: a single uniform shade of brown; symmetrical (round or oval); smaller than 6mm; flat or evenly raised; stable — they do not change from month to month. Most adults have 10-40 moles, and the vast majority are completely harmless.

Moles can slowly evolve during puberty and pregnancy due to hormonal changes. This type of gradual, uniform change across many moles is different from a single mole changing on its own.

If you'd rather show the spot than describe it, the skin cancer checker looks at the asymmetry, border and colour visible in a photo and suggests how soon to have it seen. It is a paid check, not a diagnosis.

Most of your moles should look similar to each other — they are siblings. An ugly duckling is the mole that looks obviously different from all your other moles. It might be darker, larger, more irregular, or a completely different color or shape than its neighbors.

Studies show that the ugly duckling sign catches melanomas that the ABCDE criteria miss. When you examine your skin, look for the outlier — the mole that does not match the rest.

Health anxiety about moles is extremely common. If you are checking your moles multiple times per day, photographing them obsessively, or losing sleep over them, the anxiety itself may need attention. Over 90% of biopsied suspicious moles are not melanoma.

A single thorough dermatologist visit can provide enormous relief. If you have seen a dermatologist and been cleared, trust that evaluation. Set a regular self-check schedule (monthly) and try to limit checking to that schedule.

These features are almost always benign: a mole you have had since childhood that has not changed; a mole that is perfectly round and one color; a flat mole smaller than 3mm; a mole that is the same as all your other moles; a skin tag (soft, pedunculated growth); cherry angiomas (tiny bright red dots, common after 30).

The single most important factor is change. A mole that has looked the same for years is vastly more likely to be benign than one that recently appeared or changed.

Step 1: Take a clear, close-up photo of the mole with a ruler or coin for scale. Step 2: Run through the ABCDE criteria honestly. Step 3: Compare it to your other moles — is it an ugly duckling? Step 4: If any criteria are positive, book a dermatologist appointment. If all criteria are negative but you are still worried, book an appointment anyway — peace of mind is worth the visit.

Do not attempt to remove, cut, or burn a mole yourself under any circumstances.