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A typical symptom of an allergic reaction to hair dye often manifests as itching or a rash. This reaction occurs due to the chemicals within the hair dye, particularly allergens like paraphenylenediamine (PPD), which can trigger the immune system's response in sensitive individuals. The body's defense mechanisms react to these chemicals, resulting in inflammation, redness, and discomfort in the form of itching or the development of a rash.

On the other hand, while dryness can occur due to various hair treatments, it is not specifically indicative of an allergic reaction. Excessive oiliness is unrelated to allergic responses and suggests other issues, like scalp conditions or overactive sebaceous glands. Hair loss can have many causes, such as stress or hormonal changes, but it is not typically a direct symptom of an allergic reaction to hair dye.