It would depend if they were fibroblastic or occult. I would not get a horse with fibroblastic sarcoids. I dealt with that with my late TB gelding, he had them up and down his ventral line, on his sheath, in his ears and on his dock. We tried all manner of treatments for a full 3 years, and he is actually one of I believe 2 horses on record to die from them. An experimental treatment is thought to have caused them to internalize and upon his necropsy we found sarcoids on his spinal cord. That killed him.
Occult sarcoids are smooth surfaced and not bleeding or raw. I have never had problems with them and would feel fine buying a horse with them.
What a terrible story, karliejaye- really sorry about your horse!
OP, my mare has both occult and nodular sarcoids in her right front "armpit" area. In my case, I have been pretty lucky. As far as I can tell, it's never made her uncomfortable. They are far enough forward that they don't bother the girth, though it's close.
I treated pretty aggressively on recommendation of my vet with a topical cream (which is actually used to treat genital warts in humans
) when I first bought her; The only reason I treated is because I went to see her one morning, and what had been a pea sized lump that looked like a little pimple had exploded into an alien looking blood filled orb 2-3 times the size of what it was. Now it is back to a little pimple, but never went away fully (though never became "angry" again). The occult sarcoid didn't respond much to the treatment, it looks like a big patch of dry skin. The nodular sarcoid is right in the middle of the occult one.
I think I'd avoid buying a horse that has sarcoids in the girth area. I've also read that the aural plaques in ears can be quite painful for horses and difficult to treat, so not sure I'd want to take that on either.