The ABCDE Rule: How to Spot Dangerous Moles

The ABCDE rule is a simple method that allows you to identify suspicious changes in your moles on your own. It was developed by dermatologists and is the most important guide for early detection of melanoma (black skin cancer) worldwide. Each letter represents a characteristic that can indicate a potentially malignant change.

Benign moles are usually symmetrical: if you draw an imaginary line through the center, both halves are nearly identical. It becomes suspicious when a mole is asymmetric — meaning it has an irregular shape. Melanomas often grow irregularly and therefore show clear asymmetry.

Pay attention to the edges of your moles. Benign moles have smooth, well-defined borders. Blurry, frayed, or jagged edges can indicate melanoma. Color bleeding into surrounding skin is also a warning sign.

Normal moles have a uniform color — usually a consistent brown. If a mole has multiple colors (various shades of brown, black, red, white, or blue), you should have it examined. Color changes over time are also an important warning sign.

Moles with a diameter larger than 6mm (about the size of a pencil eraser) should be examined by a doctor. However, melanomas can also be smaller — especially in early stages. The key factor is an increase in size.

Perhaps the most important criterion: Is a mole changing? Any change in size, shape, color, height, or surface should be monitored and, if necessary, examined by a doctor. New symptoms such as itching, bleeding, or crusting are also warning signs.

If one or more of the ABCDE criteria apply to a mole, you should see a dermatologist promptly. The earlier skin cancer is detected, the better the chances of recovery. For melanomas in early stages, the 5-year survival rate is over 95%. DermCheck's AI analysis can give you an initial assessment — but it never replaces a visit to the doctor.