Could Severe Pain In Buttocks Be Due To Hairline Fracture?

I FELL AT WORK TWO DAYS AGO, AT FIRST I FELT NOTHING NOW JUST THE BUTT CHEEK THAT i FELL ON REALLY HURTS... SITTING, LAYING IN CERTAIN POSITIONS, AND WALKING . THERE'S NO BRUISE ON THE OUTSIDE BUT IT HURT LIKE HECK...COULD THERE BE A HAIRLINE FRACTURE? IF SO HOW IS THIS TREATED?