Is there any heat in the joints above the hoof? Any swelling further up the leg? If the farrier was " rough" or got in a fight it is possible it isn't in the foot but maybe some of the soft tissue as well. With out knowing exactly what happened and not seeing te horse we can only speculate at best but I would start by pulling the shoe and see what you have. Could be a hot nail just putting pressure on the quick to a nail right in the quick to an abscess to like I said a soft tissue injury further up the leg. Just can't tell until you start working to eliminate the causes.