When is a patch test conducted?

A patch test is conducted before using new products to check for allergic reactions. This procedure is essential for ensuring client safety, as it helps to identify any potential sensitivities or allergies that a client may have to specific ingredients in the product. By applying a small amount of the product to a discreet area of the skin and observing for any adverse reaction over a set period, practitioners can prevent negative outcomes, such as allergic reactions or skin irritations, during treatment.

Conducting this test is particularly important when introducing new products, as it allows for a proactive approach to client safety and can enhance trust in the esthetician's care. While the other options describe important aspects of service and client management, they do not address the specific purpose and timing of a patch test in relation to product use.