Why does prolonged exposure to ultraviolet (UV) radiation increase the risk of skin cancer, despite the skin's natural barrier?

💡 Explanation

UV radiation can damage DNA within skin cells, and while the skin possesses DNA repair mechanisms, prolonged exposure overwhelms these systems because the rate of damage exceeds the capacity for repair. Therefore, mutations accumulate, increasing cancer risk, rather than triggering increased sebum or collagen production, or decreasing melanocyte activity.

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