What is a common symptom of a skin allergy to hair dye?

A common symptom of a skin allergy to hair dye is a rash or redness. This reaction occurs because the skin is responding to the chemicals in the dye that may cause irritation or an allergic reaction. When an individual is sensitive to certain ingredients, like para-phenylenediamine (PPD), the immune system mistakenly identifies these components as harmful, leading to inflammation and visible symptoms such as rashes, redness, hives, or even blistering in severe cases.

In contrast, the other symptoms listed typically do not align with allergic reactions specifically linked to hair dye. Increased hair growth is unrelated to skin allergies and often pertains to hormonal changes or other factors. Dryness or flaking could result from various skin conditions or environmental factors and is not exclusive to dye allergies. Puffiness around the eyes might indicate a general allergic reaction or irritation but is not the hallmark symptom of a hair dye allergy, where localized reactions at the site of application are more common.