Then this is just normal. Muscovies start to develop their masks when they are about half a year old, and it takes some time until they lose all feathers in that area and get their caruncles.
Muscovies can be nasty to each other and like to establish dominance. They may get along better over time, but sometimes a duck just becomes the least favoured of the flock and becomes a common target for temporary aggression.
Muscovies can be nasty to each other and like to establish dominance. They may get along better over time, but sometimes a duck just becomes the least favoured of the flock and becomes a common target for temporary aggression.