Duck with a lump on neck

[Duckmom1234556788]

There is also no injury to the area or anywhere on her

 

[thelordsblessing2017]

Hello, I'm a newbie and just got two ducks. they are now one week old and one has a bulge at the base of the neck/chest. Is this normal? I've attached a picture and its the one on the left as you can see the difference