Mariam+Theo is right, it’s not sore hocks yet, and they look quite similar to my boys hocks.
Indoor Rex bunnies seem to get sore hocks often and deal with them with no problem and act as if they don’t exist.
Try to get him off of abrasive flooring though - carpet is a main one. It’s quite hard to find a good flooring for rabbits so whatever works best. I would just offer a few different types of flooring - at the moment I have carpet, fleece, towels, a pillow case, wooden tiles on my floor just to make sure that he can chose to lay where ever feels best for him.
And to try and treat them, you can try coconut oil, f10 ointment, bag balm or even just plain old Vaseline, this is just to protect it a little. You can also try putting baby socks on him if he’ll let you, and if you take him to the vet, you could get them to wrap them for him, but usually they only do that for actual sore hocks. My vet saw Apollo (my rabbit) four times and had to keep telling me that they couldn’t do anything about it
But other than that, just keep an eye on it. If it’s gets worse or causes him problem, take him to the vet