My seven year old thoroughbred is just off the track. I have been taking it slow with him. He has no past injuries, just a little thin. I recently noticed that his front leg is swollen on the inside between his knee and his ankle. He has a knot on that leg now also. He has never been lame, even at the peak of the swelling. The vet said it may be a strained tendon and to leave him in for one week. He has been in for three weeks and it has randomly swelled again. He is in no pain. My trainer felt it and said she thinks he's ok to jump but his swelling was down at the time she looked at it. Any ideas of what this could be and how to treat it?