It was reported by Feffer McScwuff of MSCBS back in 2004 that Alizée had forehead reduction surgery. There were complications from this surgery, that is why her break from singing was much longer than anticipated. Her latest hairstyles are an attempt to cover up the scars from that surgery.
Feffer is the reporter who interviewed her late last year. Here is the link to that interview.
http://www.youtube.com/results?searc...+mcscwuff&aq=f