Skin Cancer Risk Factors: 11 Causes and Prevention Strategies

Skin cancer (melanoma, BCC, SCC) arises from DNA damage in skin cells, primarily from UV radiation. Risk is cumulative and multifactorial.

Major Risk Factors

1. UV Radiation (Sun): UVA (aging) + UVB (burning) → DNA mutations. Sunburns, especially childhood, ↑ melanoma risk.
2. Artificial UV: Tanning beds (Group 1 carcinogen); 75% ↑ melanoma if first use <35.
3. Fair Phenotype: Fitzpatrick I–II (pale skin, red/blond hair, blue/green eyes, freckles) → less melanin protection.
4. Genetics/Family History: CDKN2A, BRCA2, MITF mutations; 1st-degree relative with melanoma → 2–3× risk.
5. Immunosuppression: Transplant recipients (100× SCC risk), HIV, chemo/biologics.
6. Age: Cumulative UV damage; most diagnoses >50, but melanoma rising in young adults.
7. Geography: Equatorial, high altitude, ozone depletion zones → higher UV index.
8. Outdoor Occupation/Recreation: Farmers, lifeguards, pilots, golfers.
9. Prior Skin Damage: Severe sunburns, actinic keratoses, previous skin cancer → field cancerization.
10. Chemical Exposures: Arsenic (well water), PAHs (coal tar, soot), certain pesticides.
11. Radiation Therapy: Prior RT field → ↑ BCC/SCC decades later.

Prevention

• Broad-spectrum SPF 30+ daily; reapply 2-hourly.
• UPF clothing, wide-brim hat, UV-blocking sunglasses.
• Seek shade 10 AM–4 PM.
• No tanning beds.
• Monthly self-exam (ABCDE); annual dermatologist skin check.

Early detection = near 100% cure for melanoma in situ.