Astringent

An astringent is a substance that causes tissues in the body to tighten or shrink. It works by constricting blood vessels and closing pores, which can help reduce bleeding, minimize oiliness, and soothe irritated skin. Common examples include certain skincare products like toner, which contain ingredients such as witch hazel or alcohol. Astringents are often used to improve skin appearance or control excess oil, and they can also have medicinal uses to reduce bleeding or inflammation.