just a longshot mate, a few months back my dog fractured her metatarsal on her hind leg, after 4 wks of rest, i started to slowly road walk her, started of 1 mile a day, after the second day a lump appeared where the fracture was, it was soft to touch but caused her no pain, i treated it with witch hazel once a day for a week and it went down and hasn't returned since, as i say it's a longshot but here is a pic of the good leg and bad so you can see the difference, cheers......john.