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World Skin Cancer Day: Learn the ABCDE Rule to Detect Dangerous Moles

13/06/2026 12:59 - Salud

melanoma cáncer de piel dermatología regla ABCDE prevención solar

Dermatólogo profesional examinando con dermatoscopio un lunar en el brazo de un paciente, iluminación clínica, ambiente médico moderno, diagrama ABCDE en pantalla digital de fondo

World Skin Cancer Day: A Key Date for Prevention

Every June 13, the world commemorates World Skin Cancer Day, established to raise awareness about the importance of early detection and prevention of the most common malignant tumor globally. In Argentina alone, more than 11,600 new cases are detected each year, representing a major public health challenge.

What is Skin Cancer?

Skin cancer is the abnormal growth of cells in the layers of the skin, typically caused by excessive exposure to ultraviolet rays from the sun or tanning beds. There are different types:

Basal Cell Carcinoma: The most common type, grows slowly and rarely spreads. It usually appears as a pearly bump or pinkish growth.
Squamous Cell Carcinoma: Can spread if not treated in time. Often appears as scaly red patches or open sores.
Melanoma: The most aggressive and dangerous type. Represents only 1% of cases but causes the majority of deaths. Can develop anywhere on the body, even in areas not exposed to sun.

ABCDE RULE: The Method to Identify Dangerous Moles

The ABCDE rule is a simple guide developed by dermatologists to help people recognize suspicious signs in their moles. If you detect any of these characteristics, consult a specialist immediately:

Letter	Meaning	What to Look For
A	Asymmetry	If you divide the mole in half, both parts are not equal. Benign moles are usually symmetrical, with matching halves.
B	Borders	Irregular, jagged, or poorly defined borders. Healthy moles should have sharp, uniform edges that look smooth.
C	Color	Presence of multiple colors (brown, black, red, blue, white) or color changes. A healthy mole typically has a uniform single color.
D	Diameter	Larger than 6 millimeters (approximately the size of a pencil eraser). However, melanomas can be smaller when first detected.
E	Evolution	Changes in size, shape, color, elevation, or appearance of symptoms like bleeding, itching, or crusting. Any change is worth investigating.

Important: Not all suspicious moles are cancerous, but any mole presenting these characteristics should be evaluated by a dermatologist. When in doubt, always get it checked.

Alarming Statistics

Argentina registers more than 11,600 new cases annually, according to the Instituto Alexander Fleming.
Melanoma causes the majority of skin cancer deaths despite being only 1% of cases.
90% of cases are related to sun exposure, making it largely preventable.
The cure rate exceeds 95% when detected in early stages.
One person dies of melanoma every hour globally, according to the World Health Organization.

Risk Factors

Fair skin, blonde or red hair, light-colored eyes (common in populations of European descent, including many Argentines).
History of sunburns, especially during childhood.
Presence of many moles (more than 50).
Family history of skin cancer.
Intense and repeated sun exposure (common in countries with high UV indices like Argentina).
Weakened immune system.

Prevention Recommendations

Sun Protection

Use SPF 30 or higher sunscreen, even on cloudy days. Apply 30 minutes before sun exposure.
Reapply every 2 hours and after swimming or sweating.
Avoid sun exposure between 10 AM and 4 PM, when UV rays are strongest.
Wear protective clothing, wide-brimmed hats, and UV-blocking sunglasses.
Seek shade whenever possible.

Medical Check-ups

Perform regular self-examinations of your skin, ideally once a month.
Use a mirror to check hard-to-see areas, or ask a partner to help.
Consult a dermatologist immediately if you notice any suspicious mole.
Annual skin exams for people with risk factors.
Digital photography of moles for monitoring changes over time.

Context for International Readers

Argentina, located in South America, has a population with diverse ethnic backgrounds, including significant European ancestry (particularly Italian and Spanish). This genetic heritage, combined with the country's location near Antarctica (where the ozone layer is thinner) and cultural beach habits, makes skin cancer a significant public health concern. The Instituto Alexander Fleming mentioned in this report is one of Argentina's leading cancer research and treatment centers in Buenos Aires, named after the discoverer of penicillin.

A Message of Hope

Skin cancer is highly treatable when detected early. The cure rate for melanoma in its initial stage exceeds 95%, reinforcing the importance of regular check-ups and applying the ABCDE rule as a preventive tool. Early detection saves lives.

Sources: Statistical data was corroborated with information from the Instituto Alexander Fleming (Argentina) and the World Health Organization. For more information, consult your local dermatologist or cancer association.