Doomed dunnock?

Hi all,

I spotted a dunnock today with some growths around beak and feet. I wondered if anyone could help identify if this is disease (avian pox?). It's the only time i've seen this dunnock, and i have others that are healthy. This one turned up today. No other signs of disease in garden, but wondering whether to immediately stop feeding. Photo might be rubbish as upload limit meant i had to reduce repeatedly - possibly making the poor dunnock look even more diseased and pixelated! 

Thanks for any advice.