That white spot could be significant, but silkies because of their coloring, look so different than other chickens in pictures. There can be cysts, abscesses, or puss in the eye. One BYC member found a piece of a weed stuck in his chicken's eye after he had tried treating it for coryza for weeks without success. When he removed the object the infection went away. If you have a friendly dog or horse vet who you regularly go to, maybe they could help. They don't have to know that much about chickens, but can help sometimes. In the meantime, I would apply some warm compresses to his eye for 15 minutes while you hold him (and watch a show together or read BYC.) That will help soften the crust under his eye, and if you can see solid pus in the eye, it has to be removed.