An astringent substance is a type of chemical that contracts and firms up body tissues and membranes. Astringents are often used to treat conditions such as acne, hemorrhoids, and sore throats. However, not all astringent substances are created equal. There are many synonyms for this type of substance, including constringent, puckering, styptic, and desiccant. Constringent is a term used to describe a substance that contracts or tightens tissues. Puckering refers to a substance that causes the skin or mucous membranes to become tight and dry. Styptic is commonly used to describe substances that help stop bleeding, while desiccant refers to any substance that absorbs moisture.