User blog comment:FairyRaven/Fairy Tail Chapter 387: Tartarus Arc, Part 4: Father and Son, Review and Commentary/@comment-111.119.214.29-20140606101704/@comment-7418318-20140606113601

Hey, now that you mention it, Cancer did use some magical shampoo that made Flare's hair grow inclredibly fast.

Though a new look with shorter hair for a while might also be interesting.