My driver side front end cap started throwing grease this morning on the drive to work, but I dont know the issue exactly. I'm thinking a seal but I want to be sure before I buy it.

 

Front wheel bearings have a single seal at the rear, and an endcap on the outside. So is liquid grease running out of the little hole ? Normally grease stays where it is unless heat melts it. So you might have a hot bearing.