What is a significant effect of exposure to UV rays on the skin?

Exposure to UV rays has a profound impact on the skin, particularly in causing damage to blood vessels, which can lead to broken capillaries. When the skin is exposed to ultraviolet radiation, it can trigger inflammatory responses that weaken the blood vessels, resulting in their rupture and the appearance of red or purple lines on the skin’s surface. This effect can be exacerbated by factors such as prolonged sun exposure, which can lead to a myriad of skin issues, including premature aging and a compromised skin barrier.

The other options do not accurately reflect the typical effects of UV exposure. For instance, individuals usually experience increased melanin production as a defense mechanism against UV radiation, which leads to tanning. Similarly, UV rays do not improve skin elasticity; rather, they tend to cause the opposite effect by damaging collagen and elastin fibers, leading to decreased skin firmness and elasticity over time. Additionally, UV exposure can worsen the appearance of acne scars instead of reducing them, as sun damage can lead to inflammation and discoloration in existing scars.