My bun got sore hocks last winter, when he was poorly with something unrelated. It healed well with cleaning, applying of antibacterial cream and wrapping. If the skin is not broken you can use spray-on band aid, but don’t if there’s broken skin, because it would be very painful. Read the instructions for use carefully and protect the bun’s eyes etc. I used Opsite spray-on bandage for dogs and cats, but there are many other brands.
Many buns will remove any form of bandage put on them, but you could try and see how it goes. Here’s instructions with pictures of how to make the wrap described in the link Dface gave you http://www.bio.miami.edu/hare/sorehocks.html
I always save the fur I brush off of rabbits, because it is the absolute best material to wrap sore hocks with. I had to take good care to really tuck the piece of fur in under the self-adhesive wrap, because if my bun could grab the fur sticking out, he’d pull it out of the wrap.
In my case I think the culprit was a rather abrasive wool mat, that I’ve since covered with two big vet bed mats. I know some people here have had good results with memory foam bath mats in the rabbit area.
Sudocrem is OTC. It has zinc oxide, which helps with healing. You can also use Manuka honey, but if you do, wrapping is a must, because Manuka honey is very palatable for rabbits (it tastes like normal honey), and they will lick it off if they can reach it.