Hi, I have a female 1.5 years old rabbit. I, today found my rabbit’s bottom area was covered in gooey poop and it really smelled. When I cleaned up, I found her opening swollen and it bright red. Apart from that, she has been eating less since 2-3 days ago. I will be going to the veterinary today but wanted to know what could be the reason. I’m also attaching the photo of it.