Blaze, my 20 year old gelding. Two weeks ago a lump came up on his left shoulder. I called the vet and he X-rayed it and said no broke bones or chips. He also ultrasound it and said that there were no puss. The swelling is getting bigger and there is a lot of Heat in the area. It's slowing moving down his shoulder. I have been putting DMSO & Dep on it everyday with no luck on it getting any smaller. He has no loss of hair or any drainage to the shoulder what so ever. He is in pain so butt is also given daily. At wits end.....any suggestion on what this could be.