If I were you, I'd put some triple antibiotic ointment on it. Then clean all the roosts and the "poop pile" under the roost. To reduce the chances of bumblefoot, keep 3-4 inches of bedding in the coop.
It's just taking extreme preventative measures for the health of your chicken.
No just him. He's got a wooden perch in there he sits on a lot too. His other foot was a smooth worn spot also. I just put the cream on both feet and used an antibacterial cleaner in his perch and cage bottom.