ABSTRACT
Hairdressing products are commonly used on a daily basis. A wide variety of hairdressing products containing natural and synthetic compounds is commercially available. However, the product ingredients may not be standardized or fully tested yet[1]; they may cause immediate- or delayed-type reactions. Contact urticaria syndrome presents immediately after direct contact of the urticariogenic substance with the skin. Clinical manifestations are due to immunologic (immunoglobulin E–mediated) or nonimmunologic responses to the offending substance. However, urticarial reactions with unknown mechanisms have been reported. The presentation varies from local wheals, flare, and itching to generalized urticarial reaction, respiratory and gastrointestinal distress, and anaphylactic shock.[2,3]
