New York State Barber Practice Exam 2025 - Free Barber Licensing Practice Questions and Study Guide

When a client is allergic to a hair product, a common reaction involves itching and redness of the affected area. Allergic reactions typically occur when the immune system responds to a substance in the product, which can lead to localized inflammation. The skin may become irritated, resulting in redness and a strong urge to scratch the area, as the body attempts to react to what it perceives as a harmful substance.

In contrast, dry scalp is associated with conditions such as dehydration or product buildup but is not a direct indicator of an allergic reaction. Increased hair growth is unrelated to allergies and would not manifest as a response to a hair product. Similarly, scalp moisture typically refers to the hydration level of the scalp and does not correlate with an allergic reaction. Hence, itching and redness are the hallmark signs of an allergic response, making this the correct choice.