California Cosmetology Practice Exam

Not performing a patch test before hair treatments can lead to scalp irritation or allergic reactions because patch testing helps to determine whether an individual has a sensitivity or allergy to the products being used. This is crucial as many hair treatment products contain chemicals that could cause adverse skin reactions. By conducting a patch test—applying a small amount of the product to a discreet area and observing for any negative reaction—cosmetologists can protect clients from potential harm. Options such as increased hair shine, improved hair texture, or faster hair growth are not relevant in this context, as they do not pertain to the consequences of failing to perform a patch test. Instead, they describe possible benefits or outcomes that might be unrelated to the safety aspect of the treatment process. Hence, focusing on the potential for scalp irritation or allergic reactions is essential for ensuring client safety and well-being.