Judging from your other thread three months ago this doesn't look like sore hocks, you should really see a vet so they can run some tests it could be skin condition can be allergy or fungus or something else, and you need to diagnose it properly before putting any treatment on it, because you can make things even worse. Now people will be suggesting treatments for sore hocks but your old photo clearly shows it's something else
Now, can you tell us what were you using on it over past three months and how it progressed.
Also, what you use for cleaning? Is your rabbit indoor or outdoor? Is he toilet trained? What litter do you use? Can you post some photo of his setup and where he lives/his area
Here's your old thread from April for reference and photo of how it looked then. Fur loss wasn't where the sore hocks could appear
https://www.rabbitsonline.net/threads/i-don’t-know-what-to-do-😬.97777/