Hair Dye Allergy: Symptoms, PPD Triggers & Patch Testing
Hair Dye Allergy Hair dye allergy is usually a form of contact dermatitis caused by ingredients such as p‑phenylenediamine (PPD). Symptoms can include itching, burning, redness, swelling, or blisters on the scalp, face, ears, or neck, sometimes appearing up to 72 hours later. A patch test before each use and choosing lower‑risk formulas can reduce […]