Hi, ive noticed when i look up my symptoms alot of people have experienced the same reactions to lightening products on scalp but havent came across anyone who has had a straight answer for this. I have lightened my hair for years and only recently been having reactions causing hand and feet to itch, hives on legs arms and chest, swollen bottom lip and tightness/sensitivity on scalp. this happens with bleach and high lift tints of various brands. currently going through allergy tresting for possibilities but wondered if anyone had any answers on the cause yet?