What are common symptoms of an allergic reaction to hair dye?

The symptoms of an allergic reaction to hair dye typically involve the skin and manifest as redness, itching, swelling, or a rash at the site of application. These symptoms are indicative of the body's immune response to allergens, commonly present in hair dye formulations. The presence of these symptoms suggests that the individual’s skin is reacting negatively to one or more of the chemicals in the dye, which could include ingredients such as para-phenylenediamine (PPD) and other sensitizers.

While hair loss and brittleness, dryness and split ends, as well as increased shine and smoothness can occur due to various factors involved in hair care and treatment, they are not specific indicators of an allergic reaction. Hair loss and brittleness may result from over-processing or damage to the hair fibers, dryness and split ends commonly arise from lack of moisture or nourishing care, and increased shine and smoothness are typically signs of healthy, well-treated hair. Therefore, these symptoms do not correlate with the immune response triggered by an allergic reaction to hair dye.