Final answer:
Skin cancer is primarily caused by excessive exposure to UV radiation, which damages the DNA in skin cells. Protective measures such as sunscreen and clothing can help prevent it, and factors beyond sun exposure may also contribute to its development.
Step-by-step explanation:
Skin cancer is the uncontrolled growth of abnormal skin cells and is most commonly caused by long-term exposure to UV radiation, which damages the DNA of skin cells. The three common types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma, with melanoma being the most likely to spread to other organs. To prevent skin cancer, it is advised to wear sunscreen with a high SPF, protective clothing, and hats when exposed to the sun. Additionally, while some people believe that a mole is a form of cancer, this is not true; however, changes in a mole's appearance can indicate a risk of melanoma.
The Skin Cancer Foundation states that one in five Americans will develop skin cancer in their lifetime, demonstrating its prevalence. Furthermore, even though melanin does provide some protection against UV damage, overexposure can still lead to skin cancer, even in those with dark skin or in areas not frequently exposed to sunlight, suggesting other factors may also contribute to the development of cancerous lesions.