Missouri Board of Cosmetology Practice Exam

What is a "skin patch test" used for?

1. To determine hair color

2. To assess scalp health

3. To determine a client's sensitivity to new products

4. To check for signs of infection

The correct answer is: To determine a client's sensitivity to new products

A skin patch test is specifically utilized to determine a client's sensitivity to new products. This is particularly important in the cosmetology field as it helps practitioners assess how an individual’s skin may react to different chemicals or ingredients found in hair dyes, skincare products, and other cosmetics. By applying a small amount of the product to a patch of skin, usually on the forearm, and observing the reaction over a set period, professionals can identify any allergic reaction or irritation. This is essential for ensuring client safety and satisfaction and minimizing the risk of adverse reactions during treatments or applications. The other options focus on unrelated aspects of cosmetology. Determining hair color is based on various factors such as natural pigment and desired shade rather than a sensitivity assessment. Assessing scalp health involves evaluating conditions like dryness or dandruff without an emphasis on product sensitivity. Checking for signs of infection pertains to health assessments rather than testing for reactions to products.