Milady Cosmetology Practice Exam 2025 – All-in-One Guide to Master Your Cosmetology Certification!

Signs of an allergic reaction to hair dye typically manifest as redness, itching, or swelling on the scalp. These symptoms result from the body's immune response to certain chemicals found in hair dyes, particularly in products that contain ingredients such as para-phenylenediamine (PPD). This inflammatory reaction can vary in intensity from mild irritation to more severe responses, depending on the individual's sensitivity to the dye.

Other options provided, such as dryness and split ends, increased shine of hair, or hair loss during washing, do not indicate an allergic reaction. Instead, these may be associated with other factors like hair health or quality, usage of products, or environmental conditions. Therefore, recognizing the specific symptoms of redness, itching, or swelling is essential for identifying a potential allergic reaction and protecting the client from possible further complications.

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