Hydroquinone - A truthful straight answer. I have thyroid issues. I have cancer issues. I also have melasma, brown spots. I read a report from 2007 regarding carcinogenic, reports recently that it HAS caused serious issues for people with immune issues, and effects/damages DNA. DOES IT cause all these issues? Tired of articles like on here...stating its in obagi products and skirting around the fact it causes health issues. Id like to know once and for all. Thanks