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Many hair dyes contain ammonia, PPD (paraphenylenediamine), resorcinol, and peroxide, chemicals that can trigger allergies or long-term damage if used carelessly.
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A tingling, burning or itchy scalp soon after applying dye may indicate chemical irritation or mild allergic reaction.
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Skin redness, rash, or swelling around the hairline, ears, or neck suggests contact dermatitis.
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If blisters, hives, or oozing patches appear, stop using the product immediately. This could indicate an allergy to PPD or other dye ingredients.
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Strong fumes or volatile chemicals like ammonia can irritate mucous membranes.
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If you feel light-headed or short of breath while colouring, step away immediately. These could be signs of inhaling chemical vapours in a poorly ventilated room.
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Repeated dyeing strips natural oils and weakens hair strands. If your hair is snapping easily, the chemicals may be damaging the keratin structure.
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Over-processing can rob hair of moisture. Persistent dryness, frizz, or rough texture are signs your cuticle layer is compromised.
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Mild tenderness post-colouring may be due to chemical burns or irritation. If pain lingers for days, it's time to consult a dermatologist.
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Dryness and inflammation from harsh dyes can mimic dandruff. Look for flakes plus itching or redness as these point to chemical irritation, not fungus.
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Redness, swelling, or hives appearing 24-48 hours later indicate delayed hypersensitivity to dye ingredients.
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