This really doesnt look good at all, but you know that.

You could perhaps try Beaphar OTC  ivermectin spot on (rabbit safe antiparasitic that’s effective against several skin parasites) but this looks more like it’d need antibiotics. It kind of reminds me of hot spots that dogs can get.

(PSA: Dont use any antiparasitic containing fipronil on a rabbit. It can be deadly toxic to rabbits. End of PSA).

I know it is currently difficult to get a vet appt for a rabbit, but I think you need to keep trying. To my knowledge there isn’t any kind of OTC antibiotic ointment available in the UK. Manukka honey can be used on buns, but she would probably want to clean it off with her paws to eat it, since its very tasty.

Ugh how stressful. I do agree with Bam that you should keep trying… this does look like it needs veterinary attention.  Sometimes it helps to call first thing in the morning when they open and don’t downplay anything. Stress that she has a swollen and open wound on her face that is getting worse.

I don’t know how things work there, but I agree with Dana. You should try calling right when they open and explain that he is in urgent need of attention. Even if my vet is booked, they have allowed me to drop off first thing in the morning. Then they look at bunny between appointments when they have time.