Pennsylvania Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Redness and itching are common symptoms of an allergic reaction to hair dye. These reactions often occur due to sensitivities to certain chemicals found in hair dyes, particularly those containing dyes like paraphenylenediamine (PPD). When a person with an allergy is exposed to these ingredients, the immune system reacts, leading to inflammation. This manifests as redness, swelling, and itching in the areas where the product is applied, such as the scalp and skin around the hairline. Recognizing these symptoms is critical for individuals working in or receiving hair services, as it prompts immediate action to avoid further exposure and manage the allergic reaction effectively.

In contrast, while symptoms such as a dry scalp, hair loss, or dull hair may occur due to various other factors, they are not specific indicators of an allergic reaction to hair dye. Dry scalp can result from environmental factors or over-washing, hair loss may be related to numerous health issues, and dull hair is often the result of lack of moisture or damage rather than an immune response.