Which factor can lead to the formation of broken capillaries?

Alternating cold and hot temperatures can lead to the formation of broken capillaries due to the stress they place on the skin's blood vessels. When skin experiences rapid fluctuations in temperature, it can cause the capillaries to expand and contract quickly. Over time, this can weaken the capillary walls and lead to their rupture, resulting in visible broken capillaries.

While high humidity levels and excessive sunlight exposure can impact skin health, they are not as directly linked to the specific mechanism of capillary damage. Lack of hydration can certainly affect skin elasticity and overall appearance, but it does not typically cause broken capillaries in the same way that temperature changes do. Understanding how environmental factors influence skin conditions is crucial for effective beauty therapy practices.