Missouri Barber Practice Exam 2025 - Free Barber Practice Questions and Study Guide

When a client is allergic to a hair color product, the body may react to the chemicals contained in the dye. A common reaction in such cases is the development of skin irritation or a rash, which is a manifestation of the body’s immune response to the allergens present in the product. This irritation can manifest as redness, swelling, itching, or blistering of the skin, typically in areas where the product has been applied. It is important for professionals to conduct patch tests prior to the application of hair color to check for such allergies, as this can help prevent adverse reactions and ensure the client's safety.

Other options, such as an increase in hair growth, color change in hair, or split ends, do not directly correlate to an allergic reaction. Hair growth is influenced by hormonal and genetic factors rather than by exposure to hair color products. A change in hair color typically results from the hair dye’s processing, rather than an allergic response, and split ends arise from physical damage or dryness of the hair, rather than a reaction to the allergens in hair color formulations.