What causes swollen eyes in rabbits?

There are some young rabbits
At first, the area around the eyes looked like it had been scratched
Later it gradually spread to other locations
At the start it looked like scabbing
There is a lot of pus under the scab
One of them also has a badly swollen foot
I have no idea what is going on
Please, experts, help analyze this~ Attachment: You need to log in to download or view attachments. No account? Register