What parasite is it?

Hi guys, it’s my first time posting here, but I’ve been following this subreddit for a while, and I love it! Anyway, I’m writing because my horse has been having A LOT of flies flying around him (more than normal) and by a quick inspection I saw most of this little animals are laying in his ears; I’ve also noticed he’s having small bold spots on the fur and some have little blood spots (he’s probably itching a lot and scratching himself); last clue is that I noticed his fur is covered in little white eggs. We have no clue of what animal could be, we’ve tried contacting the vet yesterday, but he hasn’t answered, so I’m asking if any of you has ever had a similar experience and can help us indentify this little flies 🙏🏻