My oldest son killed a nice 8 point buck couple of years ago that had a large mass on one front shoulder. We thought it was a grown over wound possibly from a broadhead, but when I attempted to skin around it I opened it an green slime came out. I cut around that shoulder an threw it away. The rest of the deer was fine and the meat was good to eat. I have not killed a deer myself with any warts or cyst, this was a first for me after hunting deer many decades.