Whole or not whole? That is the question.

A small spot that once had a tight, sharp edge, just like a freshly baked cookie, can suddenly start to crumble. An important signal lies hidden there.

Benign versus malignant

Not all bumps and spots are a cause for concern. Benign skin conditions, such as warts, lipomas, or seborrheic keratoses, grow slowly and do not spread. They remain within their own boundaries and usually cause little more than some discomfort or aesthetic annoyance.

The ABCDE rule: rules of thumb for suspicious places

When a spot becomes irritated, the ABCDE rule is your guide:

• Asymmetry: Are the halves unequal?
• Border: Is the edge irregular or serrated?
• Color: Do you see different colors in one spot?
• Diameter: Does the spot measure more than approximately 6 mm (pencil eraser size)?
• Evolution: Does it change quickly in size, color, or texture?

Does a spot exhibit several of these characteristics? Then it warrants further investigation.

The “Ugly Duckling” signal in melanomas

Melanomas can sometimes manifest more subtly than the ABCDE check detects. Dermatologists therefore also look for the 'Ugly Duckling' signal: which spot stands out from the rest? That odd duckling could very well be a melanoma. Trust that intuitive eye and, if in doubt, have a professional take a look immediately.

Warning signs to watch out for

• Wounds that do not heal or bleed regularly
• Itching or pain around a spot
• Suddenly irregular, jagged edges
• New spots in sun-exposed areas

Not every spot is a cause for panic, but the sooner you notice abnormalities, the greater the chance of successful treatment.

Protection as a daily habit

Prevention starts with awareness. Apply a good layer of sunscreen every morning (SPF 30 or higher), even on cloudy days, and don't forget your ears, scalp, and nose. Avoid tanning beds, wear a hat and UV-protective clothing, and schedule regular self-examinations. Do you have a predisposition or have you had skin cancer before? Then have a dermatologist take a look periodically.

Conclusion

Skin cancer is a common form of cancer in the Netherlands. With the ABCDE rule, the Ugly Duckling sign, and simple preventive measures, you can effectively protect your skin and detect changes in time.