@Dennyis
can you post a picture of the foot? usually bruising takes a while to go away and is usually sort of yellowish at the end.
The duckling could have been injured internally by being thrown in to the brooder I can understand why the duckling is afraid of hands after that episode. If you want your ducklings to trust and be friendly then I would be sure all who interact with them treat them gently.
Internally injured!!? What is the symptoms ? My duckling is still behave normally
Here í the picture of the bruise