北京协和医院皮肤科主任医师、教授、博士生导师王家璧教授指出,染发剂中都有一定含量的对苯二胺(PPD),该物质具有致癌性和致敏性,在染发过程中,可能对头部皮肤产生刺激,染发水多会流到面部、颈部,引起皮肤过敏反应。如果PPD含量较高,使用者又是过敏体质,还可能出现全身过敏反应,导致接触性皮炎,使患者皮肤出现水肿、红斑、瘙痒、水泡,甚至流脓。那么,染发时,怎样才能做到不伤皮肤呢? Peking Union Medical College Hospital dermatology chief physician, professor and doctoral tutor Professor Wang Jiabi pointed out that hair dye contains a certain amount of p-phenylenediamine (PPD), the substance has carcinogenicity and allergenicity, in the process of hair dyeing may Stimulation of the skin on the head, hair dye will flow to the face, neck, causing skin allergies. If the PPD content is high, the user is allergic, systemic allergic reactions may also occur, leading to contact dermatitis, causing edema, erythema, itching, blisters and even pus in the patient’s skin. So, when hair, how can we do not hurt the skin?