Skin cancer is among the most common forms of cancer globally, and its incidence continues to rise year after year. The condition is often defined as skin cancer — the abnormal growth of skin cells, and is primarily triggered by DNA damage caused by ultraviolet (UV) radiation. While early detection and proper care can lead to successful treatment outcomes, understanding what causes skin cancer is key to effective prevention.
In this article, we explore the root causes of skin cancer, the major types of skin cancer, and the preventative measures that can help protect your skin for years to come.
What is Skin Cancer?
Skin cancer is the uncontrolled and abnormal growth of skin cells, usually occurring in areas most exposed to the sun, such as the face, neck, and hands. These abnormal cells may grow out of control and form tumours, which can be benign (non-cancerous) or malignant (cancerous). When malignant, the cells can spread to surrounding tissues or even other organs if not detected early.
Primary Cause: Ultraviolet (UV) Radiation
The leading cause of skin cancer — the abnormal growth of skin cells — is prolonged exposure to ultraviolet radiation, whether from the sun or artificial sources like tanning beds. UV radiation damages the DNA in skin cells, triggering mutations that cause them to grow uncontrollably.
There are three main types of UV rays:
- UVA – Penetrates deeply and contributes to ageing and long-term skin damage.
- UVB – Causes sunburn and has a strong link to skin cancer.
- UVC – Usually blocked by the Earth’s atmosphere, hence less of a concern.
Both UVA and UVB rays can initiate and promote cancerous changes in skin cells.
Sunburn and Blistering: A Dangerous Combination
Frequent or intense sunburns, especially during childhood or adolescence, significantly increase your risk of developing skin cancer later in life. When the skin is severely damaged, it tries to repair itself quickly. However, in doing so, errors in DNA replication may occur, leading to the abnormal growth of skin cells.
Blistering sunburns are particularly dangerous because they indicate deeper damage to the skin’s layers, which means the risk of developing cancerous cells is considerably higher.
Other Contributing Factors
While UV exposure remains the primary cause, several other factors can contribute to the development of skin cancer:
1. Skin Type and Complexion
People with fair skin, light eyes, and blonde or red hair are more susceptible due to lower levels of melanin, the pigment that protects skin from UV damage.
2. Family History and Genetics
A family history of skin cancer increases your risk, especially in the case of melanoma. Certain inherited genetic mutations can make the skin more vulnerable to UV damage and less capable of repairing itself.
3. Weakened Immune System
Individuals with compromised immune systems, such as organ transplant recipients or those undergoing chemotherapy, are at higher risk. A weakened immune system may not be able to eliminate abnormal cells efficiently.
4. Age and Gender
Though skin cancer can affect individuals of any age, older adults are more likely to be diagnosed due to cumulative sun exposure over time. Men are also statistically more prone to skin cancer than women.
5. Chemical Exposure
Contact with harmful substances such as arsenic, coal tar, and certain industrial chemicals can increase your skin cancer risk, particularly for squamous cell carcinoma.
Major Types of Skin Cancer
Skin cancer is not a singular disease but a group of cancers that affect the skin. The major types of skin cancer include:
1. Basal Cell Carcinoma (BCC)
- Most common and least dangerous form.
- Appears as a pearly bump or flesh-coloured mole.
- Grows slowly and rarely spreads, but can damage surrounding tissue if untreated.
2. Squamous Cell Carcinoma (SCC)
- The second most common.
- Often appears as a red, scaly patch or sore that doesn’t heal.
- It can spread if not detected early.
3. Melanoma
- The most dangerous type.
- Develops from melanocytes (pigment-producing cells).
- It can appear suddenly as a dark mole or change in an existing mole.
- Has a high risk of spreading to other organs.
4. Less Common Types
- Merkel cell carcinoma
- Kaposi’s sarcoma
- Cutaneous T-cell lymphoma
How to Recognise Skin Cancer
Being proactive with your skin health starts with recognising warning signs. Use the ABCDE method to evaluate moles or unusual skin growths:
- A – Asymmetry
- B – Border irregularity
- C – Colour variation
- D – Diameter over 6mm
- E – Evolving shape or size
If you notice any changes in your skin or new growths that persist, consult a doctor or visit your local skin cancer clinic.
Preventive Measures
While some risk factors, such as genetics, cannot be changed, the majority of skin cancer cases are preventable. Here’s how you can protect yourself:
1. Limit Sun Exposure
Avoid the sun during peak hours (10 am – 4 pm), when UV rays are strongest. Seek shade whenever possible.
2. Use Sunscreen
Apply broad-spectrum sunscreen with at least SPF 30 daily — even on cloudy days. Reapply every two hours and after swimming or sweating.
3. Wear Protective Clothing
Long-sleeved shirts, wide-brimmed hats, and sunglasses with UV protection can help shield your skin.
4. Avoid Tanning Beds
Artificial tanning exposes you to concentrated UV radiation, increasing your risk of all major types of skin cancer.
5. Regular Skin Checks
Schedule annual skin checks with a healthcare provider and perform monthly self-examinations.
Treatment Options
If caught early, skin cancer — the abnormal growth of skin cells — is highly treatable. Treatment depends on the type, location, and stage of the cancer. Common treatment methods include:
- Surgical removal
- Mohs surgery (for precise removal)
- Cryotherapy
- Topical medications
- Radiation therapy
- Immunotherapy (for advanced melanoma)
Importance of Early Detection
Early diagnosis not only improves the chances of successful treatment but can also reduce the need for extensive surgery or more aggressive therapy. Melanoma, when detected early, has a high survival rate. However, if it spreads to other organs, it becomes significantly harder to treat.
Final Thoughts
Skin cancer is a serious but preventable and treatable disease. The key to reducing your risk lies in understanding the causes, primarily UV exposure, and taking active steps to protect your skin.
If you notice any changes in your skin or wish to book a comprehensive skin check, don’t wait. Early intervention could save your life.
Contact Us
For trusted and professional skin cancer care, visit SunSkin Clinic. Our experienced medical team offers full-body checks, imaging of lesions, and advanced treatment options for all major types of skin cancer.
