Which of the following best describes the main function of a facial steamer?

The main function of a facial steamer is to hydrate and soften the skin. When steam is applied to the face, it increases the temperature of the skin, which leads to the dilation of blood vessels and promotes circulation. This process helps to enhance the hydration levels of the skin, making it more supple and soft. Additionally, the steam opens up the pores, which aids in the removal of impurities and prepares the skin for subsequent treatments, such as extractions or applying masks.

While other options touch on important aspects of facial treatments, they do not capture the primary role of a facial steamer. Exfoliation is typically achieved through other methods, such as scrubs or chemical exfoliants, while extractions refer specifically to the process of removing blackheads and other debris from the pores. The application of masks is a separate step in a facial treatment, often following the use of steam to optimize the mask's effectiveness. Thus, the role of the facial steamer is most accurately described as aiding in the hydration and softening of the skin.