The first thing to note when white hair grows in the back of the head area is whether this white hair is scattered or limited. If the white hair grows in a confined area and the scalp is also porcelain white, consider that this white hair may be caused by vitiligo. For this situation, you need to go to the local hospital to irradiate the Wooden lamp, if the hair or scalp under the lamp shows bright white, more obvious than the naked eye, basically can be determined is vitiligo. For treatment, you can topically apply strong topical hormone cream or tacrolimus cream, also with 308 laser irradiation, generally need to be used for several months in a row before the recovery of pigmentation will occur.