What is a primary benefit of using a facial steamer during a skincare treatment?

One primary benefit of using a facial steamer during a skincare treatment is that it improves blood circulation. The heat generated by the steam causes blood vessels to dilate, which enhances blood flow to the skin. This increased circulation helps deliver oxygen and essential nutrients to the skin cells, promoting a healthier complexion. Additionally, improved blood flow can assist in the natural detoxification process, allowing for better elimination of waste products within the skin. This can be especially beneficial in preparing the skin for subsequent treatments, as it may enhance the absorption of products applied afterward.

In contrast, while options like increasing skin firmness, reducing sebum production, and minimizing skin sensitivity might be desired outcomes from certain skincare treatments, these are not primary benefits directly associated with the use of a facial steamer. The steamer's role primarily revolves around hydration and circulation enhancement, making option A the most fitting answer.