My one-year-old lop rabbit has what look like a brown, scaly rash on her stomach and the inside of her hindlegs. She has also seemed to have trouble gaining weight and is very skinny. She is suffering from hair loss. I have other rabbits, so I have to keep them separated from her in case it’s infectious. The only problem is that I don’t have the space to keep her separated forever. 

I’m very worried about her, and I’m making a vet appointment as soon as possible. But I really want to try to fix it without spending a lot of money (Of course if I have to, I will), so if anyone has any idea about what it is and how to fix it, I appreciate that.