What does a skin patch test evaluate?

A skin patch test is a diagnostic method specifically designed to evaluate the skin's sensitivity or potential allergic reactions to various substances, such as skincare products, cosmetics, or allergens. When conducting a patch test, a small amount of the product in question is applied to the skin, typically on the forearm, and is covered for a set duration. This helps to ascertain whether the individual’s skin reacts adversely to the material being tested, indicating potential allergies or irritations.

This test is pivotal before introducing new products, especially for individuals with sensitive skin or known allergies, as it helps identify allergens and prevents the risk of dermatitis or other skin reactions. Regular assessment of the skin's hydration levels or pH balance is critical but does not fall under the scope of what a patch test specifically evaluates, making the other provided options less relevant in this context.