Final answer:
Clay masks work to absorb excess oil and impurities, helping to cleanse the pores. They do not hydrate or exfoliate the skin but rather draw out toxins and excess sebum, which can contribute to acne prevention when used in conjunction with regular cleansing.
Step-by-step explanation:
As clay masks dry and tighten on the skin, their primary action is to absorb excess oil and impurities from the pores. The tightening effect experienced is due to the drying process where the clay particles come closer together, creating a pulling effect that can help lift impurities from the skin’s surface. This process helps to cleanse the pores, but it is the absorptive properties of the clay that are most effective at removing oils and other contaminants that can lead to acne.
It’s important to note that while clay masks can help with oil control, they do not function as hydrators or exfoliators. Unlike occlusives, which create a barrier to maintain moisture, or humectants, which draw moisture into the skin, clay masks work by drawing out and trapping excess substances on the skin's surface. Regular cleaning of the skin with mild soap can also support the prevention of acne by removing buildup of oil and dirt.