The strange thing is that they don't seem to bother her or itch at ALL!! It's SO weird...the only reason I had to get the vet to do something about it is because the one from Autumn is right underneath one of the panels of my saddle and once it got bigger it started rubbing it raw! So I haven't ridden her with a saddle in like a month and a half, and haven't done anything except sit on her (very far forward in front of the bumps) and walk around in a month :-/
But I'm glad they're not really bothering her anyway...the vet injected them with steroids this week and said that should take care of the ones that are there, but who knows how long it will be
Now I just have to figure out how to prevent MORE of them from showing up!