Finally figured out what was wrong with the roosters foot... something called "bumblefoot". It's pretty gnarly looking, so I'll refrain from posting any pics! I did look it up on YouTube and found several videos of people performing "home surgery" to remove the problem... yuck! I can not see myself doing that! I'm just gonna continue his antiobiotics and start soaking his foot twice a day in sea salts and betadine, as others have suggested doing. Sure hope it helps! For more information on bumblefoot (and how to prevent it!), visit http://poultry.allotment.org.uk/advice/chicken-health/bumblefoot .