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The primary purpose of a patch test in skincare is to check for skin sensitivity to a product. This process involves applying a small amount of the product to a discreet area of the skin, usually on the inner arm, and monitoring for any adverse reactions, such as redness, itching, or swelling. Conducting a patch test is crucial because it helps identify allergic reactions or irritations before using a product more broadly on the face or body. This precautionary step ensures the safety and well-being of the individual, particularly for those with sensitive skin or known allergies.

While determining how quickly a product dries, identifying the best application technique, or assessing skin color change may be relevant for other aspects of skincare, they do not address the vital concern of skin sensitivity that a patch test is specifically designed to evaluate. Thus, the patch test serves as an essential initial step in safe skincare practices.