Use the ABCDE method to self-check for skin cancer warning signs

Back

2019.8.2

Protect Your Skin While Enjoying the Sun

As spring and summer approach, don’t forget to protect your skin while having fun under the sun.
According to figures from Hong Kong’s Centre for Health Protection, the incidence of skin cancer in Hong Kong has been steadily increasing.
Because early skin cancer causes no pain or itching, it can easily go unnoticed.

If a Mole Suddenly Appears, Is It a Sign of Skin Cancer?

Changes in moles or the skin’s surface may indicate early signs of skin cancer.
Whether a mole is new or long‑standing, if it grows larger, changes color, or becomes damaged, it may have become malignant. You should monitor it closely and consult a doctor promptly.

Also, pay attention to reddish patches that persist and don’t fade, or pearly‑looking bumps or tumors on sun‑exposed areas like the face, ears, or back of the hands. These may also suggest skin abnormalities that require medical evaluation.

What Is the ABCDE Rule?

Doctor’s Tip: Follow the ABCDE guideline for self‑examination.

A (Asymmetry)： Does the mole look asymmetrical when viewed from all angles?
B (Border)： Are the edges irregular or blurred? Most benign moles have smooth, round borders.
C (Color) : Is the color uneven or inconsistent? Watch for multiple shades of brown or black.
D (Diameter) : Is it larger than 6 mm or growing in size?
E (Evolution) : Are there changes in size, color, surface, or symptoms such as pain, itching, or bleeding?

Are People with Fair Skin More Prone to Skin Cancer?

One of the major causes of skin cancer is DNA damage caused by ultraviolet (UV) radiation.
Since fair‑skinned individuals have less melanin, their skin absorbs UV rays more easily, increasing cancer risk.
People with a family history of skin cancer should also be particularly careful.

Is Sun Protection Unnecessary on Cloudy Days?

Ultraviolet radiation includes two main types: UVA and UVB.
Both can penetrate clouds and damage skin tissue, leading to DNA damage and skin cancer.
UVA rays, in particular, have strong penetrating power—so even when it seems cloudy or overcast, your skin is still being exposed to UV rays.

Doctor’s Tip: Always Apply Sun Protection

Regular use of sunscreen is one of the most effective ways to prevent skin cancer.
When outdoors, wear long‑sleeved clothing to protect uncovered skin.
Those who work outdoors for long periods should routinely check their skin for new changes, and consult a doctor immediately if they notice discomfort or suspicious lesions.

Back