Marcy, see how the base of the feathers, where they attach to the shanks, is red/inflammed? That is the issue. I started a thread on them a couple years ago. There have been several folks who have seen this in their stock, all are male. There is apparently no treatment or cure. It does not seem to bother them, and I believe this to be fairly common.
The white in the feathers will grow out - it's only seen at the base now because they are young. It will get worse, more than likely. Sorry!
ETA: Here's the thread I started several years ago, along with pics: http://www.backyardchickens.com/t/244582/feather-legged-roo-with-inflamed-feather-shafts
You know what? I was down stairs spending some time with my new birdies. I was watching a chick picking the heck out of some feathers coming out of he/shes outer toes. It bothered it so bad it falling over because it was pulling so hard. I actually made itself bleed. Havent seen a chick do that before. I hope none of mine get that. One more thing I have to worry about.