That looks like an infection of some sort, so it's probably a good idea to get her to the vet asap.

It is possible that she has Pasteurella, which occurs readily in rabbits. I had a rabbit many years ago that succumb to this parasite. Has Floppers had any respiratory issues? Wikipedia had a good reference:

http://www.rabbitnetwork.org/articles/past.shtml

This also looks like a cool site for rabbits and the people who love them.

If your vet is not used to dealing with bunnies, they may overlook this. It can be treated with antibiotics.

Sending love,
Cathy