<a href="https://en.wikipedia.org/wiki/Bumblefoot_(infection)" class="extiw" title="en:Bumblefoot (infection)">Bumblefoot</a> in a Guinea pig.  This is also known as pododermatitis.
<a href="//commons.wikimedia.org/wiki/User:Joelmills" title="User:Joelmills">Joel Mills</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>