Many years ago, Crocs were a popular trend, but that fame quickly transitioned into infamy. People that wore Crocs were made fun off. That often happened on social media without the Crock owners knowing about it. It took many years for Crocs to finally disappear from our streets. This guy seems to have never stopped wearing his pair, which is a terrible shame. Just look at what happened to this feet - he actually has Crock marks on them!
Let's hope that what he has is just a nasty bout of Croc tan and not some kind of weird skin infection that changes his entire pigment structure. If this is just a consequence of tanning, then it could take between 3 and 6 months to get his feet back to normal - depending on the amount of natural melanin production his skin has. He should just wear socks and shoes in the meantime.