Maryland Cosmetology State Practice Exam

Which of these services typically does NOT require the application of a patch test?

1. Hair coloring

2. Permanent waving

3. Chemical straightening

4. Hair trimming

The correct answer is: Hair trimming

The service that typically does not require the application of a patch test is hair trimming. Hair trimming is a basic service focused solely on cutting the hair to achieve a desired length or shape, and it does not involve the use of chemicals or products that could provoke an allergic reaction. In contrast, hair coloring, permanent waving, and chemical straightening are chemical processes that can interact with the scalp and hair in significant ways, often requiring a patch test to check for possible allergic reactions to the chemicals involved. Patch tests are essential for these services to ensure the safety of the client, as allergic reactions can lead to discomfort, skin irritation, or more severe consequences. Thus, hair trimming is considered a straightforward procedure without the risks associated with chemical applications, making it unnecessary to perform a patch test before this service.