Suggest Medication For Burning Sensation On The Left Leg

Husband's left leg was pinned by a cow against a wall, There was a large bruise appeared and it is extremely sore. There are times when there is an intense burning sensation that is painful. Is there anything that he can do to alleviate the burning sensation? Yesterday evening he went to bed at 7 because he didn't feel good and his leg was burning and hurting at the same time. Any suggestions?