Which of the following is a sign of an allergic reaction to hair dye?

An allergic reaction to hair dye is characterized by specific symptoms that indicate the body’s immune response to the substances in the dye. Redness, itching, swelling, and irritation are classic signs of such a reaction. These symptoms typically manifest in areas where the product has come into contact with the skin, such as around the scalp or hairline. This response occurs because the immune system mistakenly identifies certain chemicals in the hair dye as harmful, leading to inflammation and discomfort.

In contrast, symptoms such as a dry scalp may not necessarily indicate an allergic reaction; they could result from various factors, including environmental conditions or inadequate moisturizing products. Increased hair growth is unrelated to allergic reactions and does not correlate with the application of hair dye. Similarly, improved scalp health is typically a positive outcome associated with proper treatments and care and is not indicative of an allergic response to hair dye. Understanding these distinctions is crucial for recognizing and managing adverse reactions effectively.