Kansas Cosmetology Practice Exam

What is a common symptom of an allergic reaction to hair dye?

1. Itching or rash on the scalp

2. Dryness and split ends

3. Excessive hair loss

4. Fading hair color

The correct answer is: Itching or rash on the scalp

A common symptom of an allergic reaction to hair dye is the presence of itching or a rash on the scalp. This is primarily due to the ingredients in the dye, which can trigger an immune response in susceptible individuals. When a person is allergic to a component of the hair dye, the body releases histamines in response, leading to inflammation and irritation of the skin. Consequently, this might manifest as redness, swelling, or a rash, often accompanied by intense itching. The other symptoms mentioned relate to different hair and scalp conditions rather than allergies. Dryness and split ends are typically signs of damage to the hair from over-processing or environmental factors, while excessive hair loss may be due to various causes, including hormonal changes or stress, rather than a direct allergic response. Fading hair color is often a normal outcome of hair dye wear and environmental exposure, not an indicator of an allergic reaction.