Final answer:
Using infrared light during a facial benefits circulation.
Step-by-step explanation:
The benefit of using infrared light during a facial is that it increases circulation. Infrared light has the ability to penetrate deep into the skin, which helps to stimulate blood flow and bring oxygen and nutrients to the cells. This increased circulation can promote a healthier complexion and can also contribute to the production of collagen, which helps to improve the elasticity of the skin.