worth noting in case you didn't know they don't only catch mites from other rabbits. mites are super easy for them to catch.. just most rabbits groom mites out before they become a problem. they can catch mites from things as simple as their feeding hay!
i agree it just looks like clumpy fur. i had to say though.. i've got a bunny myself who LITERALLY has visible rabbit eczema. she's a rescue i fostered, she was left outside of a pet shop with 2 of her sisters and they all had the same problem, though different stages almost? one barely had it...
they can definitely get sore hocks/urine burn from standing in poop and pee all day unfortunately. she sounds like a right little madam! before i say this i do NOT recommend keeping your rabbits on wire flooring constantly and i am against that but have you thought about a litter tray with a...