What does the cursed seal on Neji's head do?

WHEN U R READING THIS DONT STOP OR SOMETHING BAD WILL HAPPEN! MY NAME IS SUMMER I AM 15 YEARS OLD i have BLONDE HAIR ,MANY SCARS no NOSE OR EARS.. I AM DEAD. IF U DONT COPY THIS JUST LIKE FROM THE RING, COPY N POST THIS ON 5 MORE SITES.. OR.. SUMMER WILL APPEAR ONE DARK QUIET NIGHT WHEN UR NOT ExPECTING IT BY YOUR BED