Naruto--- neji

I got this info of a website for you ^^ It should explain it. I love Anime too! :D

The Hyuuga family is split into two parts: the Main House and the Branch House. The reason they are separated is because the Main House is destined to hold the original blood of the Hyuuga and as such its heritage must be protected. The Branch house was created to protect the Main House at all costs thus resulting in the death and suffering of many a Branch House member. This slighted feeling that the Branch House possess is not unfounded. The Branch House members are put under a terrible curse at a young age. A curse seal Jutsu is cast on them and the symbol of “Bird in the Cage” is marked into their forehead which will stay there until they die. This brand isn’t just to distinguish the Main House from the Branch House; it is in place so that the Main House can maintain a level of control to the lower members of the Hyuuga clan. A simple hand seal inflicts massive amount of agony into the mind of those who carry the mark and can quite easily kill them if need be. Neji belongs to the Branch House, and is marked like his fellow House members and his deceased father before him.