Gross! Sarcoids are pretty nasty. I have had 2 horses recently with them. Both presented differently, and both were treated differently.
Billy is a 17.2H bay German Sport Horse that was imported from Germany (not by me for once). When he arrived to my home, he had an unusual, slightly bumpy, but almost scar-like growth on his neck. To be honest, it looked like someone had just over-used the one side of his neck for IV shots. When I had a vet out to do injections on him months later, he said that it was definitely a sarcoid.
No sarcoid remaining. If someone looks really closely, they can see a small scar where the sarcoid was.
Craf is a 17H Estonian Warmblood. He is white, like very little grey and no flea bites. He is basically a unicorn without the horn. He was also imported, and he did not come in from Europe with the sarcoid. A few months ago when he was dealing with hind gut ulcers, he developed a nodular sarcoid in his right arm pit, basically. For the first plan of action, the vet cut out the sarcoid and sutured it up. No real follow up, other than hopefully the sarcoid should be gone. Less than 3 months later, the sarcoid had grown back and doubled in size. Just in time for Halloween, the vet sliced off the sarcoid and we left it open, nice and bloody (note its the end of fly season, so we did not have to worry about that).
This time the follow up treatment is to apply Xxterra 3 days in a row after the open wound scabs. Allow the sarcoid to fall off and a couple weeks later re-apply until hopefully, the sarcoid does not regrow. So, the Xxterra is being used in the same way as the other horse; treat until the sarcoid no longer reappears.
Sarcoids are tricky. As a vet once told me, if someone tells you they know how to treat sarcoids, they are lying. What works for one horse or in one case, will not necessarily work for another.
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