What are the signs of an allergic reaction to dye?

Itching, redness, and swelling are key indicators of an allergic reaction to dye. When a person experiences an allergic reaction, the immune system responds to a substance it perceives as harmful, leading to inflammation and discomfort in the affected area. In the context of hair dye, these symptoms can manifest on the scalp and skin during or after application, signaling a sensitivity or allergy to one of the components in the dye formulation.

The other answer choices, while they may represent different hair issues or conditions, do not accurately describe the physical signs of an allergic reaction. Dryness and breakage are more related to hair health rather than a direct allergic response. A shiny texture and smoothness are typically signs of well-conditioned hair, rather than symptoms of an allergic reaction. Color fading quickly can occur for various reasons, such as product quality or environmental factors, but it is not indicative of an allergy. Therefore, the chosen answer captures the typical physiological responses associated with allergic reactions to hair dye.