Hind Splint - new, but no pain/swelling
A little background - My mare has recently been diagnosed with navicular and then sore hocks - she's been seen by the vet more times in the past 2 months than I have seen the Dr in the past 2 years!! She has corrective shoes and is now flexion tested sound on the front end, we injected her hocks about 2 weeks ago, and I was just cleared to put her back in full work. I rode her lightly on Wed and didn't notice anything odd about her legs. On Friday when I was grooming her I found this bump just below her hock - it's the size of a splint, but cold, hard, and not painful. I went ahead and rode her and she was ok (normal by her standards). I called my vet and she thinks it is a splint, but that it definitely was not there when she injected the hock.
So... my question - has anyone had a splint pop with no heat, swelling, etc... or is there anything else it can be??
She's currently on 2 more weeks of no work just in case *sigh*
Pic - it's the bottom bump...
ETA - that's her right hock, looking at it from her front (the bump is on the outside of the leg)