Thanks for reposting the photos! The full-size now enables us to zoom in for maximum detail.
It looks like a bit of raised scales on the affected foot. Scaly leg mites shouldn't be ruled out, although it's extremely rare in such a young chick. The treatment is to dip his feet in castor oil, massaging it well into the legs and feet. It can't hurt, even if he has no mites.
Yes, that one toe has a demarcation line where the toe is a different color. It appears to be on the verge of dying. Get a magnifying glass and examine it carefully for a hair that may have wrapped around that toe.
It looks like a bit of raised scales on the affected foot. Scaly leg mites shouldn't be ruled out, although it's extremely rare in such a young chick. The treatment is to dip his feet in castor oil, massaging it well into the legs and feet. It can't hurt, even if he has no mites.
Yes, that one toe has a demarcation line where the toe is a different color. It appears to be on the verge of dying. Get a magnifying glass and examine it carefully for a hair that may have wrapped around that toe.