What is an allergen?

An allergen is defined as a substance that has the potential to trigger an allergic reaction in sensitive individuals. This can include a wide range of substances, such as certain foods, pollen, pet dander, and specific chemicals found in skincare products. The key characteristic of an allergen is its ability to invoke an immune response, leading to symptoms that may range from mild irritation to severe allergic reactions. Understanding the role of allergens in skincare is crucial for professionals, as they must be able to identify and recommend products that are safe and suitable for clients with known allergies or sensitivities.

The other answers, while related to skincare, do not accurately define what an allergen is. For instance, a substance that improves skin texture and a product that boosts hydration may be beneficial properties of certain skincare ingredients, but they do not relate to the potential for allergies. Similarly, a skincare ingredient could be an allergen if it triggers an adverse reaction, but not all skincare ingredients inherently qualify as allergens. It’s the potential to cause an allergic response that defines an allergen distinctly.