I'm a little bit worried. My mare has this...thing on her eye. It's been there for a few days, and we thought it was stye, but it's worrying me because it's not going away. I'm not sure, if it is a stye, how long they stay. You'll notice in the picture her eyes are very red. She has allergies so her eyes are pretty much always bloodshot. Sorry for the low quality pics. I had to take them on my phone.
Does anybody have any clue what this is? She doesn't keep that eye closed or wink a lot with it, she just has that....thing.