I'm struggling with some problems similar to that, but not open. Locals don't know what the heck it is, just write it off as an abcess. Got a several cows and a calf with it. Starts out as a lump on side of jaw or neck. I captured one of them and got it to drain. Nastiest looking stuff I ever saw. I put out medicated mineral and notice all of them starting to drain now. I'll work them in a week or two and do a mechanical drain, flush with iodine and follow up with LA200. Best thing I could come up with is a variance of wooden tongue, or at least the same bacteria that causes wooden tongue.