Sarcoids in horses are the most common skin tumour in horses and a frustration for horse owners and vets. They can look like anything from thinning hair or a wart right through to a massive lump. Just like most things with horses, its complicated, but Bec and Dr Glenn break down what sarcoids in horses could look like, why they appear, the various treatment options and what you should do if your horse has a suspected sarcoid or a lump.