Bruises under my skin?

Yesterday, I sort of got into a little fight and afterwards, my pinkie finger's metacarpal began to hurt very badly. Its feeling better today, but it still feels as though I've bruised it, like there's a bruise under my skin. It hurts and throbs at even the slightest pressure and I can feel pulsing when left alone. Could it be broken? And what should I do about it, if anything?